Noun | 1. | Dinocerata - small order of primitive ungulates of the Paleocene and Eocene animal order - the order of animals Ungulata - in former classifications a major division of Mammalia comprising all hoofed mammals; now divided into the orders Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates) family Uintatheriidae, Uintatheriidae - an extinct family of Dinocerata |