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From: Webster's Revised Unabridged Dictionary (1913)

 Phthal·ic a.  Chem. 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.
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