methacrylic acid

/M EH1 TH AH0 K R IY0 L IH0 K AE0 S AH0 D/
noun
  1. 1

    A colourless liquid, an unsaturated organic acid, used in the manufacture of resins and plastics, with the chemical formula CH2:C(CH3)COOH.

Source: https://en.wiktionary.org/wiki/methacrylic%20acid