/ Dictionary / Index S spare tire: Meaning and Definition of Find definitions for: spare' tire' Pronunciation: [key] a tire used or kept available as an emergency replacement on a vehicle. excess fat around the waistline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spareribs sparge Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language