beef·a·lo 
(bēfə-lō′)
(bēfə-lō′)n. pl. beefalo or beef·a·los or beef·a·loes
A hybrid that results from a cross between the North American bison (buffalo) and beef cattle and is typically 3/8 bison and 5/8 domestic cattle. Beefalo yields leaner beef than conventional breeds of cattle.
[Blend of BEEF and BUFFALO.]