/ Dictionary / Index O octofoil: Meaning and Definition of Find definitions for: oc•to•foil Pronunciation: (ok'tu-foil"), [key] — n. Heraldry. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. octodecimo octogenarian Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language