Dimetrodon

Dimetrodon (n; meaning `two measures of teeth`) is an extinct genus of synapsid that lived during the Early Permian, around 295–272 million years ago (Ma). It is a member of the family Sphenacodontidae. The most prominent feature of Dimetrodon is the large sail on its back formed by elongated spines extending from the vertebrae. It walked on f.....
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Dimetrodon

(pronounced die-MET-roh-don) Dimetrodon was a prehistoric animal with a large sail; it was not a dinosaur but a pelycosaur , an early synapsid.
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dimetrodon

noun carnivorous dinosaur of the Permian in North America having a crest or dorsal sail
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Dimetrodon

extinct relative of primitive mammals that lived from about 286 million to 270 million years ago during the Early Permian Period, fossils of which ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/d/50

dimetrodon

[n] - carnivorous dinosaur of the Permian in North America having a crest or dorsal sail
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