amnios

1. 1.

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

   Synonymsamnionamniotic sac

   Broadersac

   Part ofamniotefetal membrane

   mammal

Other forms of amnios

plural

amnioses·

Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.

Questions about amnios

What does amnios mean?

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

How many syllables are in amnios?

amnios has 3 syllables: am-ni-os. The stress falls on "am".

What is another word for amnios?

Close synonyms include amnion, amniotic sac. 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 amnios a common word?

amnios 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.