noun
1. : a very large seal ( Mirounga leonina ) formerly abundant along many coasts of the southern hemisphere but hunted nearly to extermination for its oil and having a male that attains a length of 20 feet and has a long inflatable proboscis
2. : a very similar smaller seal ( Mirounga angustirostris ) formerly abundant along the California and Lower California coast but now restricted to a single herd protected by the Mexican government on the island of Guadalupe