Phthalic /(?)/

Phthal·ic

Phthalic

a.
  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.