U·in·ta·the·ri·um n. Paleon. An extinct genus of large Eocene ungulates allied to Dinoceras. This name is sometimes used for nearly all the known species of the group. See Dinoceras.
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Uintatherium
n : type genus of the Uintatheriidae; extinct large herbivorous
ungulates somewhat resembling elephants; from the Eocene
in Wyoming [syn: genus Uintatherium]