01 a. Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances.
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1.
Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances.(Chem.)
Phrases & compounds
Phthalic acid —
a white crystalline substance, C6H4.(CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins.