mononychus olecranus

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a turkey-sized long-legged fossil 75 million years old found in the Gobi Desert having bird-like fused wrist bones and keeled breastbone and a long tail resembling a dinosaur's; short forelimbs end in a single claw instead of wings; classification as bird or dinosaur is in dispute