Synapsida

Từ điển WordNet v3.1 - WordNet Dictionary

noun

extinct reptiles of the Permian to Jurassic considered ancestral to mammals
• Syn:
subclass Synapsida
• Hypernyms:
class
• Member Holonyms:
Reptilia, class Reptilia
• Member Meronyms:
Therapsida, order Therapsida, Ictodosauria, order Ictodosauria, Pelycosauria, order Pelycosauria