discoidaladj.

Brit.

/dɪˈskɔɪdl/, U.S.

/dɪˈskɔɪd(ə)l/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin discoides , -al suffix¹.

Etymology: < post-classical Latin discoides discoid adj. + -al suffix¹. Compare post-classical Latin and scientific Latin discoidalis (1799 or earlier in sense 2, 1875 (in Haeckel) or earlier in sense 3).

1. Botany. = discoid adj. 1. Now rare.

ΘΚΠ

the world > plants > particular plants > plants and herbs > according to family > Compositae (composite plants) > [adjective] > of parts of composite plants

radiated1665

radiate1668

discoidal1706

discoid1712

disciform1830

obligulate1857

1706 Phillips's New World of Words (new ed.) Discous or Discoidal Flowers..whose Flosculi or little Leaves, are set together so close, thick, and even, as to make the surface of the Flower plain and flat like a Dish.

1727 E. Strother tr. P. Hermann Materia Medica II. 69 The Plant is corymbous, with a discoidal Flower, naked, not radiated.

1862 C. C. Babington Man. Brit. Bot. (ed. 5) 169 Receptacle without scales. Heads discoidal... Artemisia... Tanacetum.

1997 A. H. Liogier Descriptive Flora Puerto Rico V. 220 The discoid or tubular corollas may occupy the whole receptacle (discoidal heads).

2. = discoid adj. 2.

ΘΚΠ

the world > space > shape > curvature > roundness > [adjective] > circular > having shape of disc

discous1706

discoid1729

disc-like1787

disc-shaped1801

disciform1807

discoidal1808

discal1839

discose1989

1808 J. Parkinson Org. Remains Former World II. x. 68 Guided only by their conoidal or discoidal forms, he blends the simple madreporite, the porpital, and turbinated, each containing one star..with those of this class which are composed of several stars.

1851 S. P. Woodward Man. Mollusca i. 41 The discoidal planorbis sometimes becomes perforated by the removal of its inner whirls.

1869 T. H. Huxley Lessons Elem. Physiol. (ed. 3) iii. 67 By adding dense and weak solutions alternately, the [blood] corpuscles may be made to become successively spheroidal and discoidal.

1913 J. W. Jenkinson Vertebr. Embryol. ix. 232 The placenta is..discoidal in shape, and attached to the mesometric side of the uterus.

2000 C. Tudge Variety of Life ii. xii. 335 Their bodies are discoidal with a ring of spines on the margin, but without radiating arms.

3. Embryology. Designating a form of partial (meroblastic) cleavage of an ovum which produces a disc-shaped mass of cells on top of the yolk, found in animals with telolecithal eggs (including monotremes, birds, reptiles, many fishes, and certain invertebrates).

ΚΠ

1876 Jrnl. Anat. & Physiol. 10 552 Professor Haeckel states that no sharp and fast line can be drawn between the types of ‘unequal’ and ‘discoidal’ segmentation.

1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xv. 220 Meroblastic cleavage is either discoidal or superficial. In the former the result of cleavage is the formation of a platelike disc of cells about the animal pole leaving the yolk at the vegetal pole undivided.

1997 B. McMahon et al. in W. W. Burggren & B. B. Keller Devel. Cardiovascular Syst. xi. 139 Cephalopods undergo meroblastic discoidal cleavage, which has an expressed bilateral symmetry from the beginning.

This entry has been updated (OED Third Edition, December 2013; most recently modified version published online June 2022).

单词	discoidal
释义	discoidaladj. Brit. /dɪˈskɔɪdl/, U.S. /dɪˈskɔɪd(ə)l/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin discoides , -al suffix¹. Etymology: < post-classical Latin discoides discoid adj. + -al suffix¹. Compare post-classical Latin and scientific Latin discoidalis (1799 or earlier in sense 2, 1875 (in Haeckel) or earlier in sense 3). 1. Botany. = discoid adj. 1. Now rare. ΘΚΠ the world > plants > particular plants > plants and herbs > according to family > Compositae (composite plants) > [adjective] > of parts of composite plants radiated1665 radiate1668 discoidal1706 discoid1712 disciform1830 obligulate1857 1706 Phillips's New World of Words (new ed.) Discous or Discoidal Flowers..whose Flosculi or little Leaves, are set together so close, thick, and even, as to make the surface of the Flower plain and flat like a Dish. 1727 E. Strother tr. P. Hermann Materia Medica II. 69 The Plant is corymbous, with a discoidal Flower, naked, not radiated. 1862 C. C. Babington Man. Brit. Bot. (ed. 5) 169 Receptacle without scales. Heads discoidal... Artemisia... Tanacetum. 1997 A. H. Liogier Descriptive Flora Puerto Rico V. 220 The discoid or tubular corollas may occupy the whole receptacle (discoidal heads). 2. = discoid adj. 2. ΘΚΠ the world > space > shape > curvature > roundness > [adjective] > circular > having shape of disc discous1706 discoid1729 disc-like1787 disc-shaped1801 disciform1807 discoidal1808 discal1839 discose1989 1808 J. Parkinson Org. Remains Former World II. x. 68 Guided only by their conoidal or discoidal forms, he blends the simple madreporite, the porpital, and turbinated, each containing one star..with those of this class which are composed of several stars. 1851 S. P. Woodward Man. Mollusca i. 41 The discoidal planorbis sometimes becomes perforated by the removal of its inner whirls. 1869 T. H. Huxley Lessons Elem. Physiol. (ed. 3) iii. 67 By adding dense and weak solutions alternately, the [blood] corpuscles may be made to become successively spheroidal and discoidal. 1913 J. W. Jenkinson Vertebr. Embryol. ix. 232 The placenta is..discoidal in shape, and attached to the mesometric side of the uterus. 2000 C. Tudge Variety of Life ii. xii. 335 Their bodies are discoidal with a ring of spines on the margin, but without radiating arms. 3. Embryology. Designating a form of partial (meroblastic) cleavage of an ovum which produces a disc-shaped mass of cells on top of the yolk, found in animals with telolecithal eggs (including monotremes, birds, reptiles, many fishes, and certain invertebrates). ΚΠ 1876 Jrnl. Anat. & Physiol. 10 552 Professor Haeckel states that no sharp and fast line can be drawn between the types of ‘unequal’ and ‘discoidal’ segmentation. 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xv. 220 Meroblastic cleavage is either discoidal or superficial. In the former the result of cleavage is the formation of a platelike disc of cells about the animal pole leaving the yolk at the vegetal pole undivided. 1997 B. McMahon et al. in W. W. Burggren & B. B. Keller Devel. Cardiovascular Syst. xi. 139 Cephalopods undergo meroblastic discoidal cleavage, which has an expressed bilateral symmetry from the beginning. This entry has been updated (OED Third Edition, December 2013; most recently modified version published online June 2022). < adj.1706
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