Source : Webster's Revised Unabridged Dictionary (1913)

Sciurus \Sci*u"rus\, n. [L., a squirrel, Gr. ?. See {Squirrel}.]
   (Zo["o]l.)
   A genus of rodents comprising the common squirrels.

Source : WordNet®

Sciurus
     n : type genus of the Sciuridae; typical moderate-sized arboreal
         squirrels [syn: {genus Sciurus}]