\U"ni*corn\, n. [OE. unicorne, F. unicorne, L. unicornis
one-horned, having a single horn; unus one + cornu a horn;
cf. L. unicornuus a unicorn. See {One}, and {Horn}.]
1. A fabulous animal with one horn; the monoceros; -- often
   represented in heraldry as a supporter.

2. A two-horned animal of some unknown kind, so called in the
   Authorized Version of the Scriptures.

         Canst thou bind the unicorn with his band in the
         furrow?                               --Job xxxix.
                                               10.

Note: The unicorn mentioned in the Scripture was probably the
      urus. See the Note under {Reem}.

3. (Zo["o]l.)
   (a) Any large beetle having a hornlike prominence on the
       head or prothorax.
   (b) The larva of a unicorn moth.

4. (Zo["o]l.) The kamichi; -- called also {unicorn bird}.

5. (Mil.) A howitzer. [Obs.]

{Fossil unicorn}, or {Fossil unicorn's horn} (Med.), a
   substance formerly of great repute in medicine; -- named
   from having been supposed to be the bone or the horn of
   the unicorn.

{Unicorn fish}, {Unicorn whale} (Zo["o]l.), the narwhal.

{Unicorn moth} (Zo["o]l.), a notodontian moth ({C[oe]lodasys
   unicornis}) whose caterpillar has a prominent horn on its
   back; -- called also {unicorn prominent}.

{Unicorn root} (Bot.), a name of two North American plants,
   the yellow-flowered colicroot ({Aletris farinosa}) and the
   blazing star ({Cham[ae]lirium luteum}). Both are used in
   medicine.

{Unicorn shell} (Zo["o]l.), any one of several species of
   marine gastropods having a prominent spine on the lip of
   the shell. Most of them belong to the genera {Monoceros}
   and {Leucozonia}.