• WordNet 3.6
    • n diapsid reptile having a pair of openings in the skull behind each eye
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Century Dictionary and Cyclopedia
    • diapsid Having two temporal arches like the members of the reptilian subclass Diapsida.
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In literature:

Their remains fall into two great groups, which are known as the Diapsid and the Synapsid reptiles.
"The Story of Evolution" by Joseph McCabe