Source : Webster's Revised Unabridged Dictionary (1913)

Sea lion \Sea" li"on\ (Zo["o]l.)
   Any one of several large species of seals of the family
   {Otariid[ae]} native of the Pacific Ocean, especially the
   southern sea lion ({Otaria jubata}) of the South American
   coast; the northern sea lion ({Eumetopias Stelleri}) found
   from California to Japan; and the black, or California, sea
   lion ({Zalophus Californianus}), which is common on the rocks
   near San Francisco.

Source : WordNet®

sea lion
     n : any of several large eared seals of the northern Pacific
         related to fur seals but lacking their valuable coat