Source : Webster's Revised Unabridged Dictionary (1913)

Ursus \Ur"sus\, n. [L., a bear.] (Zo["o]l.)
   A genus of Carnivora including the common bears.

Source : WordNet®

Ursus
     n : type genus of Ursidae: brown bears; in some classifications
         genus Ursus includes all bears [syn: {genus Ursus}]