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comparative more synapsid, superlative most synapsid
Pertaining to the class Synapsida, of animals which have an opening low in the skull roof behind each eye, leaving a bony arch beneath each. quotations examples
We are synapsid tetrapods, a group of reptiles that almost went extinct 200 million years ago in competition with the better-designed dinosaurs.
1999, Matt Ridley, Genome, Harper Perennial, published 2000, page 26
plural synapsids
Any animal (including all mammals) of the class Synapsida. examples