narwhal

An Arctic whale (Monodon monoceros) having mottled gray or whitish skin and in the male, a long spirally twisted tusk projecting forward from the left side of the head.

A cetacean, Monodon monoceros, of the family Delphinidræ and the subfamily Delphinapterinæ; the sea-unicorn, unicorn-whale, or unicorn-fish.

An arctic cetacean (Monodon monocerous), about twenty feet long. The male usually has one long, twisted, pointed canine tooth, or tusk, projecting forward from the upper jaw like a horn, whence it is called also sea unicorn, unicorn fish, and unicorn whale. Sometimes two horns are developed, side by side.

An Arctic cetacean, about 20 feet (6 meters) long; the male has a single twisted pointed canine tooth or tusk projecting forward like a horn.

small Arctic whale the male having a long spiral ivory tusk