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|n.pl.||1.||(Paleon.) An extinct order of Mammalia found in the South American Tertiary formation. The incisor teeth were long and curved and provided with a persistent pulp. They are supposed to be related both to the rodents and ungulates. Called also Toxodontia.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.