/ Dictionary / Index T thickening: Meaning and Definition of Find definitions for: thick•en•ing Pronunciation: (thik'u-ning), [key] — n. a making or becoming thick. a thickened part or area; swelling. something used to thicken; thickener. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thickening (Thesaurus) thickener thicket Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language