| synapsid | (n) extinct reptile having a single pair of lateral temporal openings in the skull, Syn. synapsid reptile |
| synapsida | (n) extinct reptiles of the Permian to Jurassic considered ancestral to mammals, Syn. subclass Synapsida |
| 単弓類 | [たんきゅうるい, tankyuurui] (n) synapsids (formerly used esp. in reference to the mammal-like reptiles) [Add to Longdo] |