Definition of unicorn

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u·ni·corn    (yn-kôrn) KEY 

NOUN:

1. 1. A fabled creature symbolic of virginity and usually represented as a horse with a single straight spiraled horn projecting from its forehead.
   2. Heraldry A representation of this beast, having a horse's body, a stag's legs, a lion's tail, and a straight spiraled horn growing from its forehead, especially employed as a supporter for the Royal Arms of Great Britain or of Scotland.
2. Unicorn Astronomy The constellation Monoceros.

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ETYMOLOGY:
Middle English unicorne, from Old French, from Late Latin nicornis, from Latin, having one horn : nus, one; see oi-no- in Indo-European roots + corn, horn; see ker-¹ in Indo-European roots