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.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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