definition of walrus, plural walrus or walruses a large gregarious marine mammal (Odobenus rosmarus of the family Odobenidae) of arctic waters that is related to the seals and has long ivory tusks, a tough wrinkled hide, and stiff whiskers and that feeds mainly on bivalve mollusks
origin and etymology of walrus: Dutch, of Scandinavian origin; akin to Dan & Norwegian hvalros walrus, Old Norse rosmhvalr