/ Dictionary / Index P plasticizer: Meaning and Definition of Find definitions for: plas•ti•ciz•er Pronunciation: (plas'tu-sī"zur), [key] — n. any of a group of substances that are used in plastics or other materials to impart viscosity, flexibility, softness, or other properties to the finished product. an admixture for making mortar or concrete workable with little water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plasticizer (Thesaurus) plasticize plastics Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language