/ Dictionary / Index S subindex: Meaning and Definition of Find definitions for: sub•in•dex Pronunciation: (sub-in'deks), [key] — pl. -dex•es, -di•ces an index to a part or subdivision of a larger category. inferior (def. 11). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subincision subinfeudate Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language