The Collaborative International Dictionary of English v.0.48:
Dinocerata \Dinocerata\ n. a small order of primitive ungulates of the Paleocene and Eocene. Syn: order Dinocerata. [WordNet 1.5]WordNet (r) 3.0 (2006):
Dinocerata n 1: small order of primitive ungulates of the Paleocene and Eocene [syn: Dinocerata, order Dinocerata]