olig- + -arch, from Ancient Greek ὀλίγοι (olígoi, “few”) + Latin -archa, -arches, from Ancient Greek -άρχης (-árkhēs), from ἀρχός (arkhós, “chief”), ultimately from Proto-Indo-European *arkhein (“to begin, rule, command”).
oligarch (plural oligarchs)
- A member of an oligarchy, someone who is part of a small group that runs a country.
- (chiefly Russia) A very rich person, particularly with political power; a plutocrat.
- (cosmogony) A protoplanet formed during oligarchic accretion.