• WordNet 3.6
    • n Diapsida used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria
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Century Dictionary and Cyclopedia
    • diapsida A subclass of Reptilia which contains those forms with (primarily) two temporal arches, a relatively small squamosal, large quadrate, and coracoid and procoracoid early coalescing, or the procoracoid degenerate: contrasted with *Synapsida.
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