morosaurus

from The Century Dictionary.

• noun A genus of dinosaurian reptiles described by Marsh from the Upper Jurassic beds of Colorado and Wyoming. The animal was of great size, but is imperfectly known. It had an extremely long and flexible neck and a short back with but ten dorsal vertebræ, resembling in general aspect the Diplodocus and Brontosaurus (which see).

from the GNU version of the Collaborative International Dictionary of English.

• noun (Paleon.) An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America.