/ Dictionary / Index Q quintuplex: Meaning and Definition of Find definitions for: quin•tu•plex Pronunciation: (kwin'too-pleks", -tyoo-, kwin-t'pleks, -ty'-, -tup'leks), [key] — adj. fivefold; quintuple. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quintuplet quintuplicate Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language