| 单词 | allantois |
| 释义 | allantois /euh lan"toh is, -toys/, n. Embryol., Zool. a vascular, extraembryonic membrane of birds, reptiles, and certain mammals that develops as a sac or diverticulum from the ventral wall of the hindgut. [1640-50; < NL < Gk allantoeidés, wrongly taken for pl. and given a sing., on the model of words like heroís (sing.), heroídes (pl.)] |
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