Dimetrodon

noun
Di·met·ro·don | \dīˈme‧trəˌdän\

Definition of Dimetrodon 

: a genus of North American Lower Permian synapsid reptiles comprising terrestrial carnivores of moderate size distinguished by a curious crest or dorsal sail supported by greatly elongated neural spines of the vertebrae

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History and Etymology for Dimetrodon

New Latin, from di- + metr- (from Greek metron measure) + -odon

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