dimetrodon

noun
di·​met·​ro·​don | \ dī-ˈme-trə-ˌdän How to pronounce dimetrodon (audio) \
plural dimetrodons

Definition of dimetrodon

: an extinct, North American, primitive synapsid (genus Dimetrodon) of the early Permian comprising terrestrial carnivores of moderate size having both canine and shearing teeth and distinguished by a large dorsal crest resembling a sail supported by greatly elongated bony processes of the spinal column

Note: Dimetrodons are often mistaken for dinosaurs but were extinct more than 35 million years before dinosaurs appeared on earth.

First Known Use of dimetrodon

1885, in the meaning defined above

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The first known use of dimetrodon was in 1885

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