/ Dictionary / Index P plastics: Meaning and Definition of Find definitions for: plas•tics Pronunciation: (plas'tiks), [key] — adj. of or pertaining to a plastic or plastics: a plastics firm; plastics research. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plastics (Thesaurus) plasticizer plastic surgery 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