NARWHAL n.
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.…
UNICORN n.
d to be the bone or the horn of the unicorn. -- Unicorn fish, Unicorn whale (Zoöl.), the narwhal. -- Unicorn moth (Zoöl.), a notodontian moth (Coelodasys unicornis) whose caterpillar has a prominent horn on its back; -- called also unicorn prominent. -- Unicorn root (Bot.), a name of two North American plants, the y…