/ Dictionary / Index P polymethyl methacrylate: Meaning and Definition of Find definitions for: pol•y•meth•yl methac'rylate Pronunciation: (pol"ē-meth'ul), [key] — Chem. Chem. polymerized methyl methacrylate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polymerous polymorph Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language