isophthalic acid
noun
iso·phthal·ic acid
: a crystalline diacid C6H4(COOH)2 isomeric with phthalic acid made usually by oxidation of meta- xylene and used in making synthetic resins and esters for use as plasticizers; meta- benzene-dicarboxylic acid
Word History
Etymology
isophthalic International Scientific Vocabulary is- + phthalic