/ Dictionary / Index O octosyllable: Meaning and Definition of Find definitions for: oc•to•syl•la•ble Pronunciation: (ok'tu-sil"u-bul), [key] — n. a word or line of verse of eight syllables. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: octosyllable (Thesaurus) octosyllabic octroi Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language