Definition of narwhal
: an arctic cetacean (Monodon monoceros) that reaches a length of about 16 feet (5 meters) and possesses in the male one or rarely two long, spirally twisted, pointed tusks
Note: Although the narwhal is classified as a toothed whale (suborder Odontoceti), it does not possess any teeth in its mouth.
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Merriam-Webster unabridged
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Time Traveler for narwhal
The first known use of narwhal was in 1646
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