Phthalic
Pronunciation : Phthal"ic
Part of Speech : a.
Etymology : [Naphthalene + -ic.] (Chem.)
Definition : Defn: Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances. Phthalic acid (Chem.), a white crystalline substance, C6H4.(CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins.
Source : Webster's Unabridged Dictionary, 1913