dimetrodon (d -m t r -d n ) An extinct, carnivorous reptile of the genus Dimetrodon of the Permian Period having a body similar to an alligator's but with a tall, curved sail on its back. The sail had a thick network of blood vessels and may have been used to regulate the animal's body temperature. The dimetrodon belonged to the synapsids, an early group of reptiles that was ancestral to mammals. |
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| Noun | 1. |  dimetrodon - carnivorous dinosaur of the Permian in North America having a crest or dorsal sailsynapsid, synapsid reptile - extinct reptile having a single pair of lateral temporal openings in the skull genus Dimetrodon - a reptile genus of Pelycosauria |
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