英语词汇“allantois”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	allantois
释义	Trends of allantois View usage for: allantois in British English (ˌælənˈtəʊɪs, əˈlæntɔɪs) noun a membranous sac growing out of the ventral surface of the hind gut of embryonic reptiles, birds, and mammals. It combines with the chorion to form the mammalian placenta Derived forms allantoic (ˌælənˈtəʊɪk) adjective Word origin C17: New Latin, irregularly from Greek allantoeidēs sausage-shaped, allantoid allantois in American English (əˈlæntoʊɪs) nounWord forms: plural ˌallanˈtoiˌdes (ˌælənˈtoʊəˌdiz) a membranous pouch with a rich blood supply in the embryos of birds, reptiles, and mammals: it is an organ of respiration and excretion for embryonic birds and reptiles: in mammals it helps form the placenta Word origin ModL < Gr allantoeidēs, sausage-shaped < allas, sausage (prob. < dial. allē, garlic, via Oscan *allo < L alium, allium) + -eidēs, -oid
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Trends ofallantois