dimetrodon

dimetrodon

[dahy-me-truh-don]
noun
an extinct carnivorous mammallike reptile, of the genus Dimetrodon, dominant in North America during the Permian Period, up to 10 feet (3.1 meter) long and usually bearing spinal sails.

Origin:
< Neo-Latin (1878), equivalent to Greek dímetr(os) having two measures (see dimeter) + odṓn tooth; apparently so named in reference to the large size of the anterior incisors relative to the other teeth

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dimetrodon   (dī-mět'rə-dŏn')  Pronunciation Key 
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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