Search Result for "synapsida": 
Wordnet 3.0

NOUN (1)

1. extinct reptiles of the Permian to Jurassic considered ancestral to mammals;
[syn: Synapsida, subclass Synapsida]



WordNet (r) 3.0 (2006):

Synapsida
    n 1: extinct reptiles of the Permian to Jurassic considered
         ancestral to mammals [syn: Synapsida, subclass
         Synapsida]