2-methylpropenoic acid 2-methylpropenoic acid /tu maɪˌθɪlproʊˈpinoʊɪk ˈæsɪd/

noun

1. An unsaturated acid (C4H6O2) used to make resins and plastics  ( 2-methylpropenoic acid , methacrylic acid )
   an unsaturated acid (C4H6O2) used to make resins and plastics