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n. pl.1.(Paleon.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Gazin, C.L., 1953, The Tillodontia: An early order of mammals: Smithsonian Miscellaneous Collections, v.