Mona \Mo"na\, n. [CF. Sp. & Pg. mona, fem. of mono a monkey, ape.]

(Zo["o]l.) A small, handsome, long-tailed West American monkey (Cercopithecus mona). The body is dark olive, with a spot of white on the haunches.

Source: Webster's Revised Unabridged Dictionary (1913)