narwhal

n. type of Arctic whale of which the male member has a long twisted tusk protruding from the upper jaw (Zoology)

The Narwhal (Monodon monoceros) is an Arctic species of cetacean. It is a creature rarely found south of latitude 70°N. It is one of two species of white whale in the Monodontidae family (the other is the beluga whale). It is possibly also related to the Irrawaddy dolphin.
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Noun
1. small arctic whale the male having a long spiral ivory tusk
(synonym) narwal, narwhale, Monodon monoceros
(hypernym) whale
(member-holonym) Monodon, genus Monodon

(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.
  

narwhal /'nɑ:wəl/
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