The Collaborative International Dictionary of English v.0.48:
Equus \E"quus\, n. [L., horse.] (Zo["o]l.) A genus of mammals, including the horse, ass, etc. [1913 Webster]WordNet (r) 3.0 (2006):
Equus n 1: type genus of the Equidae: only surviving genus of the family Equidae [syn: Equus, genus Equus]