U'NICORN, n. [L. unicornis; unus, one, and cornu, horn.] 1. an animal with one horn; the monoceros. this name is often applied to the rhinoceros.2. The sea unicorn is a fish of the whale kind, called narwal, remarkable for a horn growing out at his nose.3. A fowl.fossil unicorn, or fossil unicorn's horn, a substance used in medicine, a terrene crustaceous spar.
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