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Related to Theriodontia: Pelycosauria, Enterozoa


n. pl.1.(Paleon.) An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.