WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / A / amniotic sac amniotic sac noun /æmniɑtɪksæk/ 12 letters Scrabble 17 WWF 21 Definitions noun thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) amnionamnios Look “amniotic sac” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →