\Mo*noc"e*ros\, n. [L., fr. Gr. ?; mo`nos alone,
single + ke`ras horn.]
1. A one-horned creature; a unicorn; a sea monster with one
   horn.
         Mighty monoceroses with immeasured tails. --Spenser.
2. (Astron.) The Unicorn, a constellation situated to the
   east Orion.