dimetrodon

[ dahy-me-truh-don ]
/ daɪˈmɛ trəˌdɒn /

noun

an extinct carnivorous mammallike reptile, of the genus Dimetrodon, dominant in North America during the Permian Period, up to 10 feet (3.1 meters long and usually bearing spinal sails.

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Origin of dimetrodon

From New 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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Scientific definitions for dimetrodon

dimetrodon
[ dī-mĕtrə-dŏn′ ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.