a. [ From aconitic, by transposition of the letters. ] (Chem.) Pertaining to, or designating, an acid, C5H6O4, which is obtained as a white crystalline substance by decomposing aconitic and other organic acids. [ 1913 Webster ]
n. (Chem.) The unsaturated dicarboxylic acid CH2=C(COOH)CH2.COOH, also called methylenesuccynic acid and propylene dicarboxylic acid. [ PJC ]