/ Dictionary / Index T thickener: Meaning and Definition of Find definitions for: thick•en•er Pronunciation: (thik'u-nur), [key] — n. something that thickens. an apparatus for the sedimentation and removal of solids suspended in various liquids. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thickener (Thesaurus) thicken thickening Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language