/ Dictionary / Index S septisyllable: Meaning and Definition of Find definitions for: sep•ti•syl•la•ble Pronunciation: (sep'tu-sil"u-bul), [key] — n. a word made up of seven syllables. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Septimus septivalent Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language