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dimetrodon British & World English

A large fossil carnivorous mammal-like reptile of the Permian period, with long spines on its back supporting a sail-like crest

Dimetrodon in dimetrodon British & World English

A large fossil carnivorous mammal-like reptile of the Permian period, with long spines on its back supporting a sail-like crest

Dimetrodon in pelycosaur British & World English

A large fossil reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest