Definitions

from the GNU version of the Collaborative International Dictionary of English

  • proper n. An order of extinct reptiles including edaphosaurus and dimetrodon.

from The Century Dictionary and Cyclopedia

  • A division of reptiles, containing those Thero-morpka or Theromora which have the coracoid reduced, ribs two-headed, two or three sacral vertebræ, the centra generally notochordal, and intercentra usually present. They lived during the Carboniferous or Permocarboniferous epoch.
  • In more recent use, a group, considered by Osborn an order, of reptiles, comprising extinct species having biconcave vertebræ, perforated by the notochord and with very long spinous processes.

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

  • n. edaphosaurus; dimetrodon

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