u·ni·corn -  [yoo-ni-kawrn]

noun
1. a mythical creature resembling a horse, with a single horn in the center of its forehead: often symbolic of chastity or purity.
2. a heraldic representation of this animal, in the form of a horse with a lion’s tail and with a long, straight, and spirally twisted horn.
3. ( initial capital letter ) Astronomy . the constellation Monoceros.
4. an animal mentioned in the Bible, Deut. 33:17: now believed by some to be a description of a wild ox or rhinoceros.
5. a former gold coin of Scotland, first issued by James III in 1486, having an obverse bearing the figure of a unicorn.

Origin:
1175–1225; Middle English unicorne  (< Old French ) < Latin ūnicornis  one-horned, equivalent to uni- uni-  + corn ( ū ) horn  + -is  adj. suffix