Monoceros \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.

Source: Webster's Revised Unabridged Dictionary (1913)