/ Dictionary / Index S sequestrum: Meaning and Definition of Find definitions for: se•ques•trum Pronunciation: (si-kwes'trum), [key] — pl. -tra a fragment of bone that has become necrotic as a result of disease or injury and has separated from the normal bone structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sequestrectomy sequin Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language