/ Dictionary / Index O olig-: Meaning and Definition of Find definitions for: olig- Pronunciation: [key] var. ofbefore a vowel: oligarchy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. olibanum oligarch Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language