/ Dictionary / Index S sidewall: Meaning and Definition of Find definitions for: side•wall Pronunciation: (sīd'wôl"), [key] — n. the part of a pneumatic tire between the edge of the tread and the rim of the wheel. a wall that serves as the side of a structure. the side part of the upper of a shoe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sidewall (Thesaurus) sidewalk superintendent sideward 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