rhizo-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly.

Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from Greek. Etymons: Latin rhizo-; Greek ῥιζο-, ῥίζα.

Etymology: < post-classical Latin and scientific Latin rhizo- (18th cent. in e.g. rhizophora Rhizophora n.) and its etymon ancient Greek ῥιζο-, combining form (in e.g. ῥιζοτομός : see rhizotomist n.) of ῥίζα root (probably ultimately < the same Indo-European base as root n.¹); compare -o- connective.Earliest in borrowings and adaptations of Greek or (more commonly) Latin words; for early examples see rhizotomist n., Rhizophora n. A small number of independent formations within English are found from the early 19th cent. (apparently earliest in rhizomorphous adj. ). Compare French rhizo- (formations in which are found from the early 19th cent., e.g. Rhizopodes (see Rhizopoda n.), rhizotaxie rhizotaxis n. ).

Chiefly Botany and Medicine.

Forming nouns and adjectives with the sense ‘of or relating to a root or roots’.

rhizocarpous adj.

Brit.

/ˌrʌɪzə(ʊ)ˈkɑːpəs/

U.S.

/ˌraɪzoʊˈkɑrpəs/

(a) having a perennial root but an annual stem (rare); †(b) bearing flowers and fruit on or near the root (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries.

ΘΚΠ

the world > plants > by age or cycles > [adjective] > perennial

perennal?c1500

everlasting1578

perennial1669

vivacious1682

rhizocarpic1829

rhizocarpous1832

perpetual1837

perennating1888

1832 J. Lindley Introd. Bot. 401 Rhizocarpous, or those whose root endures many years, but whose stems perish annually; as herbaceous plants.

1859 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1092/1 Rhizocarpus..of mosses, the fructification of which is developed near the root: rhizocarpous.

1859 Ann. Sci. Discov. 350 These groups of rhizocarpous plants do not seem to have occupied, to any great extent, the consideration of botanists.

1984 Econ. Bot. 38 452 Annual, or rhizocarpous perennial herbs, they bear showy, often strongly fragrant, pentamerous, zygomorphic flowers.

rhizodontrophy n.

Brit.

/ˌrʌɪzə(ʊ)ˈdɒntrəfi/

U.S.

/ˌraɪzəˈdɑntrəfi/

/ˌraɪzoʊˈdɑntrəfi/

(also †risodontrophy) [apparently an alteration of rhizodontrypy n. after -trophy comb. form, although this is semantically inexplicable; compare earlier rhizodontropy n.] Dentistry (now disused) (a) = rhizodontrypy n.; †(b) = rhizodontropy n. (b) (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries.

ΚΠ

1863 Trans. Odontol Soc. Great Brit. 3 32 I can bear my testimony to recorded facts, that exposed pulps may be filled over..without the patient suffering pain, immediately after the operation of risodontrophy.

1865 Arch. Dentistry 1 152 Here somewhat to my astonishment, I found the word [sc. risodontrypy] transformed into Risodontrephy and Risodontrophy, forms which would indeed make Quintilian stare and gasp.

1890 J. S. Billings National Med. Dict. II. 461/1 Rhizodontrophy, operation of pivoting an artificial crown on the root of a tooth.

1902 Jrnl. Brit. Dental. Assoc. 23 725 The naphthols have more value as deodorants and cases of rhizodontrophy.

rhizodontropy n.

Brit.

/ˌrʌɪzə(ʊ)ˈdɒntrəpi/

U.S.

/ˌraɪzəˈdɑntrəpi/

/ˌraɪzoʊˈdɑntrəpi/

(also †risodontropy) [apparently an alteration of rhizodontrypy n. after -tropy comb. form, although this is semantically inexplicable] Dentistry (now disused) (a) = rhizodontrypy n.; †(b) the operation of placing a pivoting crown on a root of a tooth (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries.

ΚΠ

1855 Amer. Jrnl. Dental Sci. 5 477 It is not the province of this paper to discuss the utility of risodontropy.

1876 T. Bryant Pract. Surg. (ed. 2) I. xiii. 561 The performance of rhizodontropy, coupled or not with a direct opening into the abscess to evacuate the pus.

1897 New Sydenham Soc. Lexicon Rhizodontropy,..pivoting an artificial crown on the root of a tooth.

1903 Dominion Dental Jrnl. 15 747 The first who strongly advocated the advantage of arsenious acid over the extirpation of the living pulps by means of instruments or by the actual cautery or over the ‘Hullihen operation’ known as rhizodontropy.

rhizodontrypy n.

Brit.

/ˌrʌɪzə(ʊ)ˈdɒntrᵻpi/

U.S.

/ˌraɪzəˈdɑntrəpi/

/ˌraɪzoʊˈdɑntrəpi/

(also †risodontrypy) [compare slightly later odontotrypy n. at odonto- comb. form ] Dentistry (now disused) the operation of drilling into the pulp cavity of the root of a tooth.

ΚΠ

1853 Southern Jrnl. Med. & Physical Sci. 1 215 The treatment of exposed nerves by Dr. Hullihen's method of perforating the fangs of the teeth..has received the name of ‘Risodontrypy’.

1853 Southern Jrnl. Med. & Physical Sci. 1 362 The operation termed ‘Rhizodontrypy’, and the removal of the dental pulp, are unphysiological and impracticable.

1865 Arch. Dentistry 1 152 I chanced lately to fall in with the last number of your Journal, and..was struck by a paper on Risodontrypy; after much cogitation I came to the conclusion that the word was a compound of Latin and Greek, and consequently had something to with laughing at people with holes in their teeth.

1904 Dublin Jrnl. Med. Sci. 117 369 We note the etymologically correct spelling of ‘rhizodontrypy’ on p. 16—not found in all dental manuals.

rhizogen n.

Brit.

/ˈrʌɪzə(ʊ)dʒ(ə)n/

U.S.

/ˈraɪzədʒ(ə)n/

now rare (a) a plant that is parasitic on the roots of another plant; = rhizanth n. (now historical); (b) a part or organ from which a root or roots grow.

ΚΠ

1846 J. Lindley Veg. Kingdom 83 Rhizogens all agree in being of a fungus-like consistence.

1849 J. H. Balfour Man. Bot. §64 [Lenticels] are considered, by Decandolle.., as being the points where young roots are produced in certain circumstances, and on that account they have been called Rhizogens.

1920 New Phytologist 19 265 In the past names now forgotten such as Phanerocotyledons, Acramphibrya, Rhizogens were given with a view to correspondence with other groups supposed to be co-ordinate.

1936 Amer. Jrnl. Bot. 23 19/2 Preformed rudiments of roots or ‘rhizogens’ have been observed regularly in easily rooting woody stems.

rhizogenetic adj.

Brit.

/ˌrʌɪzəʊdʒᵻˈnɛtɪk/

U.S.

/ˌraɪzoʊdʒəˈnɛdɪk/

[after German rhizogen (1877 in the passage translated in quot. 1884 for rhizogenic adj.)] = rhizogenic adj.

ΘΚΠ

the world > plants > part of plant > root > plant defined by roots > [adjective] > having or not having roots

rootlessa1413

rooty?c1475

well-rooted1577

rooted1712

rooting1731

radicant1753

rhizomatous1812

own-root1881

rhizogenetic1884

rhizogenic1884

1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 398 Those rows of the next outer cortical layer, which lie in front of the rhizogenetic rows [Ger. der rhizogenen liegenden Reihen].

1915 Bot. Gaz. 173 60 In the matter of rhizogenetic capacity, the twigs of box elder compare well with those of black poplar.

1990 Plant Physiol. 92 1148/2 The Hartney medium was employed the activation of the rhizogenetic potential in the explants.

rhizogenic adj.

Brit.

/ˌrʌɪzə(ʊ)ˈdʒɛnɪk/

U.S.

/ˌraɪzəˈdʒɛnɪk/

[after German rhizogen (1877 in the passage translated in quot. 1884)] of, relating to, or promoting the formation of roots; root-producing.

ΘΚΠ

the world > plants > part of plant > root > plant defined by roots > [adjective] > having or not having roots

rootlessa1413

rooty?c1475

well-rooted1577

rooted1712

rooting1731

radicant1753

rhizomatous1812

own-root1881

rhizogenetic1884

rhizogenic1884

1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 351 The latter is called by Van Tieghem in the case of the Phanerograms the rhizogenic layer [Ger. die rhizogene Schicht], from the function which it performs in the origination of lateral roots.

1950 Amer. Jrnl. Bot. 37 361/1 The rhizogenic action of indoleacetic acid is probably secondary.

1997 New Phytologist 137 570/1 Morphogenesis in thin layers cultured on the rhizogenic medium is highly disturbed by these inhibitors.

rhizomania n.

Brit.

/ˌrʌɪzə(ʊ)ˈmeɪnɪə/

U.S.

/ˌraɪzoʊˈmeɪniə/

[after German Rhizomanie (J. C. Schlosser and L. Vukotinovic1854, in Oesterreichisches botanisches Wochenblatt 20 Apr. 131)] Botany (originally) an abnormal proliferation of roots, esp. as a sign of disease; (now usually) spec. a viral disease of sugar beet whose main symptom is the excessive production of small fibrous roots at the expense of the main storage root.

ΚΠ

1866 J. Lindley & T. Moore Treasury Bot. Rhizomania, an unnatural development of roots.

1889 Jrnl. Mycol. 5 226 The author describes what he calls a rhizomania in species of Ribes, i.e. a tendency in the branches to the formation of numerous, incipient, adventitious roots.

1965 Bibliogr. Agric. (U.S. Dept. Agric.) June 26/1 Alghisi, P., and others. Preliminary research on rhizomania of beets.

2001 Farmers Guardian 17 Aug. 16/5 The outgoers scheme allows growers who have suffered an outbreak of rhizomania to acquire contracted tonneage, subject to British Sugar's approval.

rhizomorphoid adj.

Brit.

/ˌrʌɪzə(ʊ)ˈmɔːfɔɪd/

U.S.

/ˌraɪzoʊˈmɔrˌfɔɪd/

chiefly Mycology (now rare) of the nature of or resembling a rhizomorph; resembling a root, root-like.

ΚΠ

1860 M. J. Berkeley Outl. Brit. Fungol. 265 O[dontia] fimbriata, Fr.; effused, membranaceous, separating from the matrix, traversed by rhizomorphoid threads.

1904 Bull. Torrey Bot. Club 31 182 The abundant rhizomorphoid mycelium is a marked feature of this species.

rhizomorphous adj.

Brit.

/ˌrʌɪzə(ʊ)ˈmɔːfəs/

U.S.

/ˌraɪzoʊˈmɔrfəs/

chiefly Mycology of the nature of or resembling a rhizomorph; resembling a root, root-like; (in early use) †belonging to the (former) genus Rhizomorpha (obsolete).

ΚΠ

1815 J. Sowerby Coloured Figures Eng. Fungi: Suppl. Tab. CCCCXXXVII This species comprehends Sphæria pedunculata and varieties bicapitated in the usual state of monoicous plants, either with peduncles or sessile, besides the longer rhizomorphous looking stipes and root.

1824 Chemist 24 July 317/1 The luminous appearances in the galleries and shafts of mines are often to be traced to rhizomorphous plants.

1912 J. R. Ainsworth-Davis tr. W. F. Bruck Plant Dis. viii. 120 These rhizomorphous or root-like strands are the chief source of infection.

2000 Jrnl. Crustacean Biol. 20 320/1 The organ of fixation may be bulb-like or rhizomorphous.

rhizophagous adj.

Brit.

/rʌɪˈzɒfəɡəs/

U.S.

/raɪˈzɑfəɡəs/

[after ancient Greek ῥιζοϕάγος eating roots] now chiefly Entomology feeding on roots.

ΘΚΠ

the world > food and drink > food > consumption of food or drink > eating > eating specific substances or food > [adjective] > eating roots

rhizophagous1832

1832 Foreign Q. Rev. Aug. 31 One unhappy generation after another of pedants, ‘rhizophagous’, living on roots, Greek or Hebrew;..wandered in nomadic wise, whither provender was to be had.

1834 T. Carlyle Sartor Resartus iii. x, in Fraser's Mag. Aug. 187/2 All Poor-Slaves are Rhizophagous (or Root-eaters).

1856–8 W. Clark tr. J. van der Hoeven Handbk. Zool. I. 404 Larvæ smooth, with 16 feet, subterranean, rhizophagous.

1933 Jrnl. Mammalogy 14 105 They [sc. rat-kangaroos] are by no means exclusively rhizophagous.

2005 Florida Entomologist 88 355 At least a third of the species sampled as larvae are rhizophagous pests.

rhizotaxis n.

Brit.

/ˌrʌɪzə(ʊ)ˈtaksɪs/

U.S.

/ˌraɪzoʊˈtæksəs/

[after French rhizotaxie ( D. Clos Ébauche de la rhizotaxie, ou, De la disposition symétrique des radicelles sur la souche (1848))] the arrangement or disposition of roots (cf. phyllotaxis n.).

ΘΚΠ

the world > plants > part of plant > root > [noun] > arrangement or system of roots

radication1658

rhizotaxis1852

1852 J. H. Balfour Class Bk. Bot. I. ii. 57 The mode in which the fibres of roots are produced and developed, thus gives origin to different forms of Rhizotaxis, or root-arrangement.

1876 Encycl. Brit. IV. 95/1 Different forms of rhizotaxis.

1991 A. D. Bell Plant Form (1993) i. 96/2 The sitings of primordia are not haphazard and varying degrees of orderliness can therefore be observed in the location of lateral roots (‘rhizotaxis’).

rhizotaxy n.

Brit.

/ˈrʌɪzə(ʊ)ˌtaksi/

U.S.

/ˈraɪzoʊˌtæksi/

[after French rhizotaxie (see rhizotaxis n.)] = rhizotaxis n.

ΚΠ

1869 M. T. Masters Veg. Teratol. i. 1 This regularity of arrangement (Rhizotaxy), first carefully studied by M. Clos, is connected with the disposition of the fibro-vascular bundles in the body of the root.

1966 Amer. Jrnl. Bot. 53 1091/2 The precise rhizotaxy of the spirally arranged roots is not known because of the obliquity of sections.

1996 Syst. Bot. 21 541/2 Lateral appendages (rootlets) leaf-like, unbranched or with single isotomous branch, borne plesiomorphically in helical rhizotaxy.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rhizo-
释义	rhizo-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from Greek. Etymons: Latin rhizo-; Greek ῥιζο-, ῥίζα. Etymology: < post-classical Latin and scientific Latin rhizo- (18th cent. in e.g. rhizophora Rhizophora n.) and its etymon ancient Greek ῥιζο-, combining form (in e.g. ῥιζοτομός : see rhizotomist n.) of ῥίζα root (probably ultimately < the same Indo-European base as root n.¹); compare -o- connective.Earliest in borrowings and adaptations of Greek or (more commonly) Latin words; for early examples see rhizotomist n., Rhizophora n. A small number of independent formations within English are found from the early 19th cent. (apparently earliest in rhizomorphous adj. ). Compare French rhizo- (formations in which are found from the early 19th cent., e.g. Rhizopodes (see Rhizopoda n.), rhizotaxie rhizotaxis n. ). Chiefly Botany and Medicine. Forming nouns and adjectives with the sense ‘of or relating to a root or roots’. rhizocarpous adj. Brit. /ˌrʌɪzə(ʊ)ˈkɑːpəs/ , U.S. /ˌraɪzoʊˈkɑrpəs/ (a) having a perennial root but an annual stem (rare); †(b) bearing flowers and fruit on or near the root (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries. ΘΚΠ the world > plants > by age or cycles > [adjective] > perennial perennal?c1500 everlasting1578 perennial1669 vivacious1682 rhizocarpic1829 rhizocarpous1832 perpetual1837 perennating1888 1832 J. Lindley Introd. Bot. 401 Rhizocarpous, or those whose root endures many years, but whose stems perish annually; as herbaceous plants. 1859 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1092/1 Rhizocarpus..of mosses, the fructification of which is developed near the root: rhizocarpous. 1859 Ann. Sci. Discov. 350 These groups of rhizocarpous plants do not seem to have occupied, to any great extent, the consideration of botanists. 1984 Econ. Bot. 38 452 Annual, or rhizocarpous perennial herbs, they bear showy, often strongly fragrant, pentamerous, zygomorphic flowers. rhizodontrophy n. Brit. /ˌrʌɪzə(ʊ)ˈdɒntrəfi/ , U.S. /ˌraɪzəˈdɑntrəfi/ , /ˌraɪzoʊˈdɑntrəfi/ (also †risodontrophy) [apparently an alteration of rhizodontrypy n. after -trophy comb. form, although this is semantically inexplicable; compare earlier rhizodontropy n.] Dentistry (now disused) (a) = rhizodontrypy n.; †(b) = rhizodontropy n. (b) (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries. ΚΠ 1863 Trans. Odontol Soc. Great Brit. 3 32 I can bear my testimony to recorded facts, that exposed pulps may be filled over..without the patient suffering pain, immediately after the operation of risodontrophy. 1865 Arch. Dentistry 1 152 Here somewhat to my astonishment, I found the word [sc. risodontrypy] transformed into Risodontrephy and Risodontrophy, forms which would indeed make Quintilian stare and gasp. 1890 J. S. Billings National Med. Dict. II. 461/1 Rhizodontrophy, operation of pivoting an artificial crown on the root of a tooth. 1902 Jrnl. Brit. Dental. Assoc. 23 725 The naphthols have more value as deodorants and cases of rhizodontrophy. rhizodontropy n. Brit. /ˌrʌɪzə(ʊ)ˈdɒntrəpi/ , U.S. /ˌraɪzəˈdɑntrəpi/ , /ˌraɪzoʊˈdɑntrəpi/ (also †risodontropy) [apparently an alteration of rhizodontrypy n. after -tropy comb. form, although this is semantically inexplicable] Dentistry (now disused) (a) = rhizodontrypy n.; †(b) the operation of placing a pivoting crown on a root of a tooth (obsolete rare).Sense (b) is apparently only attested in dictionaries or glossaries. ΚΠ 1855 Amer. Jrnl. Dental Sci. 5 477 It is not the province of this paper to discuss the utility of risodontropy. 1876 T. Bryant Pract. Surg. (ed. 2) I. xiii. 561 The performance of rhizodontropy, coupled or not with a direct opening into the abscess to evacuate the pus. 1897 New Sydenham Soc. Lexicon Rhizodontropy,..pivoting an artificial crown on the root of a tooth. 1903 Dominion Dental Jrnl. 15 747 The first who strongly advocated the advantage of arsenious acid over the extirpation of the living pulps by means of instruments or by the actual cautery or over the ‘Hullihen operation’ known as rhizodontropy. rhizodontrypy n. Brit. /ˌrʌɪzə(ʊ)ˈdɒntrᵻpi/ , U.S. /ˌraɪzəˈdɑntrəpi/ , /ˌraɪzoʊˈdɑntrəpi/ (also †risodontrypy) [compare slightly later odontotrypy n. at odonto- comb. form ] Dentistry (now disused) the operation of drilling into the pulp cavity of the root of a tooth. ΚΠ 1853 Southern Jrnl. Med. & Physical Sci. 1 215 The treatment of exposed nerves by Dr. Hullihen's method of perforating the fangs of the teeth..has received the name of ‘Risodontrypy’. 1853 Southern Jrnl. Med. & Physical Sci. 1 362 The operation termed ‘Rhizodontrypy’, and the removal of the dental pulp, are unphysiological and impracticable. 1865 Arch. Dentistry 1 152 I chanced lately to fall in with the last number of your Journal, and..was struck by a paper on Risodontrypy; after much cogitation I came to the conclusion that the word was a compound of Latin and Greek, and consequently had something to with laughing at people with holes in their teeth. 1904 Dublin Jrnl. Med. Sci. 117 369 We note the etymologically correct spelling of ‘rhizodontrypy’ on p. 16—not found in all dental manuals. rhizogen n. Brit. /ˈrʌɪzə(ʊ)dʒ(ə)n/ , U.S. /ˈraɪzədʒ(ə)n/ now rare (a) a plant that is parasitic on the roots of another plant; = rhizanth n. (now historical); (b) a part or organ from which a root or roots grow. ΚΠ 1846 J. Lindley Veg. Kingdom 83 Rhizogens all agree in being of a fungus-like consistence. 1849 J. H. Balfour Man. Bot. §64 [Lenticels] are considered, by Decandolle.., as being the points where young roots are produced in certain circumstances, and on that account they have been called Rhizogens. 1920 New Phytologist 19 265 In the past names now forgotten such as Phanerocotyledons, Acramphibrya, Rhizogens were given with a view to correspondence with other groups supposed to be co-ordinate. 1936 Amer. Jrnl. Bot. 23 19/2 Preformed rudiments of roots or ‘rhizogens’ have been observed regularly in easily rooting woody stems. rhizogenetic adj. Brit. /ˌrʌɪzəʊdʒᵻˈnɛtɪk/ , U.S. /ˌraɪzoʊdʒəˈnɛdɪk/ [after German rhizogen (1877 in the passage translated in quot. 1884 for rhizogenic adj.)] = rhizogenic adj. ΘΚΠ the world > plants > part of plant > root > plant defined by roots > [adjective] > having or not having roots rootlessa1413 rooty?c1475 well-rooted1577 rooted1712 rooting1731 radicant1753 rhizomatous1812 own-root1881 rhizogenetic1884 rhizogenic1884 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 398 Those rows of the next outer cortical layer, which lie in front of the rhizogenetic rows [Ger. der rhizogenen liegenden Reihen]. 1915 Bot. Gaz. 173 60 In the matter of rhizogenetic capacity, the twigs of box elder compare well with those of black poplar. 1990 Plant Physiol. 92 1148/2 The Hartney medium was employed the activation of the rhizogenetic potential in the explants. rhizogenic adj. Brit. /ˌrʌɪzə(ʊ)ˈdʒɛnɪk/ , U.S. /ˌraɪzəˈdʒɛnɪk/ [after German rhizogen (1877 in the passage translated in quot. 1884)] of, relating to, or promoting the formation of roots; root-producing. ΘΚΠ the world > plants > part of plant > root > plant defined by roots > [adjective] > having or not having roots rootlessa1413 rooty?c1475 well-rooted1577 rooted1712 rooting1731 radicant1753 rhizomatous1812 own-root1881 rhizogenetic1884 rhizogenic1884 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 351 The latter is called by Van Tieghem in the case of the Phanerograms the rhizogenic layer [Ger. die rhizogene Schicht], from the function which it performs in the origination of lateral roots. 1950 Amer. Jrnl. Bot. 37 361/1 The rhizogenic action of indoleacetic acid is probably secondary. 1997 New Phytologist 137 570/1 Morphogenesis in thin layers cultured on the rhizogenic medium is highly disturbed by these inhibitors. rhizomania n. Brit. /ˌrʌɪzə(ʊ)ˈmeɪnɪə/ , U.S. /ˌraɪzoʊˈmeɪniə/ [after German Rhizomanie (J. C. Schlosser and L. Vukotinovic1854, in Oesterreichisches botanisches Wochenblatt 20 Apr. 131)] Botany (originally) an abnormal proliferation of roots, esp. as a sign of disease; (now usually) spec. a viral disease of sugar beet whose main symptom is the excessive production of small fibrous roots at the expense of the main storage root. ΚΠ 1866 J. Lindley & T. Moore Treasury Bot. Rhizomania, an unnatural development of roots. 1889 Jrnl. Mycol. 5 226 The author describes what he calls a rhizomania in species of Ribes, i.e. a tendency in the branches to the formation of numerous, incipient, adventitious roots. 1965 Bibliogr. Agric. (U.S. Dept. Agric.) June 26/1 Alghisi, P., and others. Preliminary research on rhizomania of beets. 2001 Farmers Guardian 17 Aug. 16/5 The outgoers scheme allows growers who have suffered an outbreak of rhizomania to acquire contracted tonneage, subject to British Sugar's approval. rhizomorphoid adj. Brit. /ˌrʌɪzə(ʊ)ˈmɔːfɔɪd/ , U.S. /ˌraɪzoʊˈmɔrˌfɔɪd/ chiefly Mycology (now rare) of the nature of or resembling a rhizomorph; resembling a root, root-like. ΚΠ 1860 M. J. Berkeley Outl. Brit. Fungol. 265 O[dontia] fimbriata, Fr.; effused, membranaceous, separating from the matrix, traversed by rhizomorphoid threads. 1904 Bull. Torrey Bot. Club 31 182 The abundant rhizomorphoid mycelium is a marked feature of this species. rhizomorphous adj. Brit. /ˌrʌɪzə(ʊ)ˈmɔːfəs/ , U.S. /ˌraɪzoʊˈmɔrfəs/ chiefly Mycology of the nature of or resembling a rhizomorph; resembling a root, root-like; (in early use) †belonging to the (former) genus Rhizomorpha (obsolete). ΚΠ 1815 J. Sowerby Coloured Figures Eng. Fungi: Suppl. Tab. CCCCXXXVII This species comprehends Sphæria pedunculata and varieties bicapitated in the usual state of monoicous plants, either with peduncles or sessile, besides the longer rhizomorphous looking stipes and root. 1824 Chemist 24 July 317/1 The luminous appearances in the galleries and shafts of mines are often to be traced to rhizomorphous plants. 1912 J. R. Ainsworth-Davis tr. W. F. Bruck Plant Dis. viii. 120 These rhizomorphous or root-like strands are the chief source of infection. 2000 Jrnl. Crustacean Biol. 20 320/1 The organ of fixation may be bulb-like or rhizomorphous. rhizophagous adj. Brit. /rʌɪˈzɒfəɡəs/ , U.S. /raɪˈzɑfəɡəs/ [after ancient Greek ῥιζοϕάγος eating roots] now chiefly Entomology feeding on roots. ΘΚΠ the world > food and drink > food > consumption of food or drink > eating > eating specific substances or food > [adjective] > eating roots rhizophagous1832 1832 Foreign Q. Rev. Aug. 31 One unhappy generation after another of pedants, ‘rhizophagous’, living on roots, Greek or Hebrew;..wandered in nomadic wise, whither provender was to be had. 1834 T. Carlyle Sartor Resartus iii. x, in Fraser's Mag. Aug. 187/2 All Poor-Slaves are Rhizophagous (or Root-eaters). 1856–8 W. Clark tr. J. van der Hoeven Handbk. Zool. I. 404 Larvæ smooth, with 16 feet, subterranean, rhizophagous. 1933 Jrnl. Mammalogy 14 105 They [sc. rat-kangaroos] are by no means exclusively rhizophagous. 2005 Florida Entomologist 88 355 At least a third of the species sampled as larvae are rhizophagous pests. rhizotaxis n. Brit. /ˌrʌɪzə(ʊ)ˈtaksɪs/ , U.S. /ˌraɪzoʊˈtæksəs/ [after French rhizotaxie ( D. Clos Ébauche de la rhizotaxie, ou, De la disposition symétrique des radicelles sur la souche (1848))] the arrangement or disposition of roots (cf. phyllotaxis n.). ΘΚΠ the world > plants > part of plant > root > [noun] > arrangement or system of roots radication1658 rhizotaxis1852 1852 J. H. Balfour Class Bk. Bot. I. ii. 57 The mode in which the fibres of roots are produced and developed, thus gives origin to different forms of Rhizotaxis, or root-arrangement. 1876 Encycl. Brit. IV. 95/1 Different forms of rhizotaxis. 1991 A. D. Bell Plant Form (1993) i. 96/2 The sitings of primordia are not haphazard and varying degrees of orderliness can therefore be observed in the location of lateral roots (‘rhizotaxis’). rhizotaxy n. Brit. /ˈrʌɪzə(ʊ)ˌtaksi/ , U.S. /ˈraɪzoʊˌtæksi/ [after French rhizotaxie (see rhizotaxis n.)] = rhizotaxis n. ΚΠ 1869 M. T. Masters Veg. Teratol. i. 1 This regularity of arrangement (Rhizotaxy), first carefully studied by M. Clos, is connected with the disposition of the fibro-vascular bundles in the body of the root. 1966 Amer. Jrnl. Bot. 53 1091/2 The precise rhizotaxy of the spirally arranged roots is not known because of the obliquity of sections. 1996 Syst. Bot. 21 541/2 Lateral appendages (rootlets) leaf-like, unbranched or with single isotomous branch, borne plesiomorphically in helical rhizotaxy. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < comb. form1815
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