WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / subclass synapsida subclass synapsida noun 18 letters Scrabble 27 WWF 32 Definitions noun extinct reptiles of the Permian to Jurassic considered ancestral to mammals synapsida Look “subclass synapsida” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →