(n.) A very large marine mammal (Trichecus rosmarus) of the Seal family, native of the Arctic Ocean. The male has long and powerful tusks descending from the upper jaw. It uses these in procuring food and in fighting. It is hunted for its oil, ivory, and skin. It feeds largely on mollusks. Called also morse.

Loch Ness monster alevin benthon benthos cetacean crustacean dolphin dugong fingerling fish fry game fish grilse harbor seal kipper man-eater man-eating shark manatee minnow minny nekton octopus panfish plankton porpoise salmon sea dog sea lion sea monster sea pig sea serpent sea snake sea urchin seal shark shellfish smolt sponge squid tropical fish walrus whale