pluto-comb. form

Etymology: < ancient Greek πλουτο-, combining form (in e.g. πλουτοκρατία plutocracy n.) of πλοῦτος wealth, riches, perhaps < an ablaut variant of the base of πλεῖν to swim, float (see pleon n.¹), in an earlier unattested sense, to flow, hence to abound + -τος, suffix forming nouns. Compare French plouto- (formations in which are found from at least the mid 19th cent.). Attested earliest in the mid 17th cent. in plutarchy n., plutomania n., and the Greek loan plutocracy n.; formations become common from the mid 19th cent. onwards. Combining with second elements of Greek origin. The position of the stress differs between compounds of pluto- in accordance with the general stress patterns of English.