| 单词 | allantois |
| 释义 | Word Frequency allantois(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 |
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