/ Dictionary / Index S septilateral: Meaning and Definition of Find definitions for: sep•ti•lat•er•al Pronunciation: (sep"tu-lat'ur-ul), [key] — adj. having seven sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. septic tank Sept-Îles Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language