Search Result for "amniotic sac":
Wordnet 3.0

NOUN (1)

1. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals);
[syn: amnion, amniotic sac, amnios]



WordNet (r) 3.0 (2006):

amniotic sac
    n 1: thin innermost membranous sac enclosing the developing
         embryo of higher vertebrates (reptiles, birds and mammals)
         [syn: amnion, amniotic sac, amnios]