Ter`eph*thal"ic (?), 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.

© Webster 1913.