English noun: amniotic sac | |||
1. | amniotic sac (animal) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | ||
Synonyms | amnion, amnios | ||
Broader (hypernym) | sac | ||
Part meronym | amniote, fetal membrane | ||
Domain category | mammal, mammalian | ||