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单词 proctodeum
释义

proctodeumn.

Brit. /ˌprɒktə(ʊ)ˈdiːəm/, U.S. /ˌprɑktəˈdiəm/
Forms: 1800s– proctodaeum, 1800s– proctodeum.
Origin: A borrowing from Greek, combined with English elements. Etymons: procto- comb. form, Greek ὁδαῖος, English -um.
Etymology: < procto- comb. form + ancient Greek ὁδαῖος that is on or by the road (in ancient Greek only in ὁδαῖα freight, merchandise; in Byzantine Greek designating the god Hermes, to whom statues were set up by the roadside; < ὁδός way (see -ode comb. form2) + -αῖος , suffix forming adjectives) + -um, after Latin nouns in -um ; compare quot. 1876.
Zoology and Embryology.
The posterior portion of the alimentary canal, esp. in an embryo (in which it occurs as an invagination of the epiblast or ectoderm); spec. the hindgut of an insect or other arthropod. Cf. stomodaeum n.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > digestive tract
cloaca1726
proctodeum1876
stomodaeum1876
mesenteron1877
stomatodaeum1887
1876 E. R. Lankester in Q. Jrnl. Microsc. Sci. 16 64 A second invagination forms the true mouth and the stomodæum. [Note] This term and its correlative ‘proctodæum’ I propose for the oral and anal invaginations.
1904 Brit. Med. Jrnl. 17 Dec. 1632/2 Both cavities—the postanal gut and the proctodeum—are actively growing.
1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) ix. 162 The proctodæum or intestine is a long, narrow, straight tube running from the hinder end of the mesenteron to the anus.
1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxiii. 118/1 The arthropod gut is tubular and divisible into cuticle-lined stomodaeum (foregut) and proctodaeum (hindgut)..and a generally non-cuticularized midgut.
This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).
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n.1876
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