The Collaborative International Dictionary of English v.0.48:

Dromatherium \Drom`a*the"ri*um\, n. [NL., fr. Gr. droma`s
   running + qhri`on beast. See Dromedary.] (Paleon.)
   A small extinct triassic mammal from North Carolina, the
   earliest yet found in America.
   [1913 Webster]