phthal·ic acid /ˈθælɪk-/
  phthal·ic acid /ˌθælɪk-/ 名詞
  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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  phthalic acid
       n : a colorless acid used to make dyes and perfumes