|pər., |per+...- noun
Etymology: International Scientific Vocabulary per- + acetic
: a corrosive toxic strongly oxidizing unstable pungent liquid acid CH 3 COOOH made usually by oxidation of acetaldehyde or by reaction of hydrogen peroxide with acetic acid or acetic anhydride and used chiefly in a solution in acetic acid or an inert solvent in bleaching, in organic synthesis, and as a fungicide and disinfectant — called also peroxyacetic acid ; not used systematically