amniotic sac

1. 1.

   thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

   Synonymsamnionamnios

   Broadersac

   Part ofamniotefetal membrane

   mammal

Questions about amniotic sac

What does amniotic sac mean?

amniotic sac means "thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)".

What is another word for amniotic sac?

Close synonyms include amnion, amnios. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is amniotic sac a common word?

amniotic sac is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.