'Pluto monkey' definitions:

Definition of 'Pluto monkey'

From: GCIDE

Pluto \Plu"to\ (pl[=u]"t[-o]), pr. n. [L., fr. Gr. Plou`twn.]
1. (Class. Myth.) The son of Saturn and Rhea, brother of Jupiter and Neptune; the dark and gloomy god of the Lower World. [1913 Webster]
2. The ninth planet of the Solar System, the smallest (5700 km radius) and most distant from the sun. The suggestion has been made that it more closely resembles a large close comet than a planet. Its orbit has an eccentricity of 0.248, larger than that of any other planet; it varies from 4.44 to 7.37 billion km distance from the sun. [PJC]
Pluto is an oddball among its eight sister planets. It's the smallest in both size and mass, and has the most elliptical orbit. It moves in a plane tilted markedly away from the other planets' orbits. Moreover, Pluto is the only planet made almost entirely of ice. --Ron Cohen (Science News, Feb. 27, 1999, p. 139)
Pluto monkey (Zool.), a long-tailed African monkey (Cercopithecus pluto), having side whiskers. The general color is black, more or less grizzled; the frontal band is white. [1913 Webster]