pentamerousadj.

Brit.

/pɛnˈtam(ə)rəs/, U.S.

/pɛnˈtæmərəs/

Forms: also (in sense 2) represented by the abbreviation 5-merous.

Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: penta- comb. form, -merous comb. form.

Etymology: < penta- comb. form + -merous comb. form, after French pentamère (Cuvier Règne animal (1817) III. 173, as noun denoting a beetle with tarsi composed of five segments; compare earlier †pentaméré (adjective) in C. Duméril Zoologie analytique (1806) 192). Compare Hellenistic Greek πενταμερής having five parts ( < ancient Greek πεντα- penta- comb. form + -μερής : see -mere comb. form), and perhaps classical Latin pentamerīs, although this form is based on editorial conjecture.With the form 5-merous compare later five-merous adj.

1. Zoology. Consisting of or having five parts or segments; spec. (a) designating tarsi consisting of five segments or joints; (of insects) having such tarsi; (b) having or consisting of five radiating parts; (of symmetry, esp. in a starfish or other echinoderm) fivefold.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [adjective] > of leg(s) > of or relating to tarsus > consisting of five joints

pentamerous1821

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > belonging to or resembling echinoderms > of parts of > having five rays

pentamerous1870

pentameral1872

1821 W. S. MacLeay Horæ Entomologicæ ii. viii. 465 Pentamerous insects.

1828 W. Kirby & W. Spence Introd. Entomol. IV. xlvii. 376 Tarsi pentamerous.

1870 G. Rolleston Forms Animal Life Introd. 143 Echinodermata. Animals..which..combine with a radial and, ordinarily, pentamerous arrangement, traces of a bilateral symmetry.

1915 Amer. Naturalist 49 523 In the great majority of the recent crinoids the body is almost perfectly pentamerous, being composed of five similar sectors.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 171/2 The arrangement of the ambulacra..and the jaws of Aristotle's lantern is pentamerous.

2. Botany. Having five parts, or parts in groups or multiples of five. (Often written 5-merous.)

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > [adjective] > having specific arrangement or number of member parts

regular1760

decandrous1808

irregular1826

tetramerous1835

pentamerous1848

symmetrical1849

hexamerous1857

isomerous1857

octamerous1857

anisomerous1861

octomeral1871

hemicyclic1875

zygomorphic1875

zygomorphous1879

tetracyclic1880

heteromerous1882

heterocyclic1895

oligomerous1897

pleiomerous1898

decasepalous-

1848 J. Lindley Introd. Bot. (ed. 4) I. 316 Pentamerous, if a flower consists of organs in fives.

1857 A. Henfrey Elem. Course Bot. 222 Trees or shrubs with..an imbricated 5-merous calyx and corolla.

1879 Academy 11 Jan. 33/2 The four stamens of Scrophulariaceae and Labiatae are admitted to result from a degradation from the pentamerous type.

1905 I. B. Balfour tr. C. E. von Goebel Organogr. Plants II. 538 The terminal flower of Ruta graveolens is pentamerous.

1951 Dict. Gardening (Royal Hort. Soc.) I. 466/2 Choisya... Flowers white, 5-merous, in terminal and axillary cymes.

1992 M. Ingrouille Diversity & Evol. Land Plants 166 As well as their pentamerous sympetalous corolla most have an equal number of epipetalous stamens, alternating with the five corolla lobes.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pentamerous
释义	pentamerousadj. Brit. /pɛnˈtam(ə)rəs/, U.S. /pɛnˈtæmərəs/ Forms: also (in sense 2) represented by the abbreviation 5-merous. Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: penta- comb. form, -merous comb. form. Etymology: < penta- comb. form + -merous comb. form, after French pentamère (Cuvier Règne animal (1817) III. 173, as noun denoting a beetle with tarsi composed of five segments; compare earlier †pentaméré (adjective) in C. Duméril Zoologie analytique (1806) 192). Compare Hellenistic Greek πενταμερής having five parts ( < ancient Greek πεντα- penta- comb. form + -μερής : see -mere comb. form), and perhaps classical Latin pentamerīs, although this form is based on editorial conjecture.With the form 5-merous compare later five-merous adj. 1. Zoology. Consisting of or having five parts or segments; spec. (a) designating tarsi consisting of five segments or joints; (of insects) having such tarsi; (b) having or consisting of five radiating parts; (of symmetry, esp. in a starfish or other echinoderm) fivefold. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [adjective] > of leg(s) > of or relating to tarsus > consisting of five joints pentamerous1821 the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > belonging to or resembling echinoderms > of parts of > having five rays pentamerous1870 pentameral1872 1821 W. S. MacLeay Horæ Entomologicæ ii. viii. 465 Pentamerous insects. 1828 W. Kirby & W. Spence Introd. Entomol. IV. xlvii. 376 Tarsi pentamerous. 1870 G. Rolleston Forms Animal Life Introd. 143 Echinodermata. Animals..which..combine with a radial and, ordinarily, pentamerous arrangement, traces of a bilateral symmetry. 1915 Amer. Naturalist 49 523 In the great majority of the recent crinoids the body is almost perfectly pentamerous, being composed of five similar sectors. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxi. 171/2 The arrangement of the ambulacra..and the jaws of Aristotle's lantern is pentamerous. 2. Botany. Having five parts, or parts in groups or multiples of five. (Often written 5-merous.) ΘΚΠ the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > [adjective] > having specific arrangement or number of member parts regular1760 decandrous1808 irregular1826 tetramerous1835 pentamerous1848 symmetrical1849 hexamerous1857 isomerous1857 octamerous1857 anisomerous1861 octomeral1871 hemicyclic1875 zygomorphic1875 zygomorphous1879 tetracyclic1880 heteromerous1882 heterocyclic1895 oligomerous1897 pleiomerous1898 decasepalous- 1848 J. Lindley Introd. Bot. (ed. 4) I. 316 Pentamerous, if a flower consists of organs in fives. 1857 A. Henfrey Elem. Course Bot. 222 Trees or shrubs with..an imbricated 5-merous calyx and corolla. 1879 Academy 11 Jan. 33/2 The four stamens of Scrophulariaceae and Labiatae are admitted to result from a degradation from the pentamerous type. 1905 I. B. Balfour tr. C. E. von Goebel Organogr. Plants II. 538 The terminal flower of Ruta graveolens is pentamerous. 1951 Dict. Gardening (Royal Hort. Soc.) I. 466/2 Choisya... Flowers white, 5-merous, in terminal and axillary cymes. 1992 M. Ingrouille Diversity & Evol. Land Plants 166 As well as their pentamerous sympetalous corolla most have an equal number of epipetalous stamens, alternating with the five corolla lobes. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < adj.1821
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