noun
extinct reptiles of the Permian to Jurassic considered ancestral to mammals
• Syn: ↑Synapsida
• Hypernyms: ↑class
• Member Holonyms: ↑Reptilia, ↑class Reptilia
• Member Meronyms: ↑Therapsida, ↑order Therapsida, ↑Ictodosauria, ↑order Ictodosauria, ↑Pelycosauria, ↑order Pelycosauria
Useful english dictionary. 2012.