Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A constellation near Canis Major and Canis Minor.

from The Century Dictionary.

  • noun A unicorn, or some other one-horned animal, real or imaginary.
  • noun [capitalized] A constellation, the Unicorn, south of the Twins and the Crab, and between the two Dogs, introduced by Jacob Bartsch in 1624.
  • noun The narwhal, Monodon monoceros.
  • noun [capitalized] In zoology:
  • noun A genus of prosobranchiates of the family Muricidæ, so called from the large spine on the outer lip; the unicorn-shells. There are several species from the west coast of America.
  • noun A genus of balistoid fishes.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A one-horned creature; a unicorn; a sea monster with one horn.
  • noun (Astron.) The Unicorn, a constellation situated to the east Orion.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun astronomy A winter constellation of the northern sky, said to resemble a unicorn. It lies amid the Milky Way, just east of the constellation Orion.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English, unicorn, from Old French, from Latin monocerōs, from Greek monokerōs, having one horn : mono-, mono- + keras, horn; see ker- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

First recorded by the astronomer Jakob Bartsch in 1624, but possibly created earlier by Petrus Plancius. From Latin monoceros, a "unicorn"

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