[1] : The Collaborative International Dictionary of English v.0.48

ursus \ur"sus\, n. l., a bear. zool.
   a genus of carnivora including the common bears.
   1913 webster

[2] : WordNet (r) 2.0

ursus
     n : type genus of ursidae: brown bears; in some classifications
         genus ursus includes all bears syn: genus ursus
see also:
genus ursus 

Ursus >> U Words
Ursus, definition of term: Ursus
ursus_pag1.html

Ursus Horribili >> U Words
Ursus Horribili, definition of term: Ursus Horribili
ursus+horribili_pag1.html

Ursus Americanu >> U Words
Ursus Americanu, definition of term: Ursus Americanu
ursus+americanu_pag1.html

Ursus Arctos >> U Words
Ursus Arctos, definition of term: Ursus Arctos
ursus+arctos_pag1.html