Terephthalic

a. [ Terebene + phthalic. ] (Chem.) Of, pertaining to, or designating, a dibasic acid of the aromatic series, metameric with phthalic acid, and obtained, as a tasteless white crystalline powder, by the oxidation of oil of turpentine; -- called also paraphthalic acid. Cf. Phthalic. [ 1913 Webster ]