/ Dictionary / Index S sebum: Meaning and Definition of Find definitions for: se•bum Pronunciation: (sē'bum), [key] — n. Physiol. the fatty secretion of the sebaceous glands. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sebum (Thesaurus) SEbS sec 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