The Collaborative International Dictionary of English v.0.48:
Sciurus \Sci*u"rus\, n. [L., a squirrel, Gr. ?. See Squirrel.] (Zool.) A genus of rodents comprising the common squirrels. [1913 Webster]WordNet (r) 3.0 (2006):
Sciurus n 1: type genus of the Sciuridae; typical moderate-sized arboreal squirrels [syn: Sciurus, genus Sciurus]