noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   amnion archaic
2. 2
   thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) wordnet

Synonyms

All synonyms

amnionamnionamniotic sac

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.