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phthalic anhydride

Syllabification: (phthal·ic an·hy·dride)

Definition of phthalic anhydride

noun

Chemistry

a crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes.
- A bicyclic anhydride; chemical formula: C₆H₄(CO)₂O