Meaning of SUBCLASS SYNAPSIDA

WordNet Dictionary
	Definition:		[n]  extinct reptiles of the Permian to Jurassic considered ancestral to mammals
	Synonyms:		Synapsida
	See Also:		class, class Reptilia, Ictodosauria, order Ictodosauria, order Pelycosauria, order Therapsida, Pelycosauria, Reptilia, Therapsida