| amniotic sac See amnion. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  amniotic sac - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)amniote - any member of the Amniota mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus sac - a structure resembling a bag in an animal |
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