therapsid

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Definitions (2)

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  1. noun Any of various reptiles of the order Therapsida of the Permian and Triassic periods, many of which are considered to be direct ancestors of mammals.

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Examples (7)

 

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Etymologies (1)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. From New Latin Thērapsida, order name : Greek thēr, wild animal; see theropod + Greek hapsis, hapsid-, arch, vault (from the enlarged lower temporal opening characteristic of the order); see apsis.
 

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