/ Dictionary / Index O oakum: Meaning and Definition of Find definitions for: oa•kum Pronunciation: (ō'kum), [key] — n. loose fiber obtained by untwisting and picking apart old ropes, used for caulking the seams of ships. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oakum (Thesaurus) oaktag Oakville Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language