Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various carnivorous pelycosaurs of the genus Dimetrodon of the Permian Period, having long spines on the back that supported a sail-like structure, and powerful jaws with sharp teeth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A carnivorous synapsid, of the genus Dimetrodon, from the Permian period

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[New Latin Dimetrodōn, genus name : Greek di-, two; see di– + Greek metron, measure; see mē- in Indo-European roots + Greek odōn, tooth (from its having two different kinds of teeth); see dent- in Indo-European roots.]

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