/ Dictionary / Index S sidebone: Meaning and Definition of Find definitions for: side•bone Pronunciation: (sīd'bōn"), [key] — n. Vet. Pathol. ossification of the cartilages in the lateral portion of the foot of a horse, resulting in lameness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sideboard sideburns 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