nounWord forms: plural -ruses or -rusa pinniped mammal, Odobenus rosmarus, of northern seas, having a tough thick skin, upper canine teeth enlarged as tusks, and coarse whiskers and feeding mainly on shellfish: family Odobenidae
Word origin
C17: probably from Dutch, from Scandinavian; compare Old Norse
hrosshvalr (literally: horse whale) and Old English
horschwæl; see
horse,
whale