The Collaborative International Dictionary of English v.0.48:

Sea lion \Sea" li"on\ (Zool.)
   Any one of several large species of seals of the family
   Otariidae 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.
   [1913 Webster]