Plu″to (plū″tō̍), n. [L., fr. Gr. Πλοúτων.] (Class. Myth.) The son of Saturn and Rhea, brother of Jupiter and Neptune; the dark and gloomy god of the Lower World.
Pluto monkey(Zoöl.), a long-tailed African monkey (Cercopithecus pluto), having side whiskers. The general color is black, more or less grizzled; the frontal band is white.