Webster's 1913 Dictionary
PHTHALIC
Phthal "ic, a. Etym: [Naphthalene + -ic. ] (Chem. )
Defn: 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.
New American Oxford Dictionary
phthalic acid
phthal ic ac id |ˈTHalik ˌθælɪk ˈæsəd | ▶noun Chemistry a crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring. [Chem. formula: C 6 H 4 (COOH ) 2; three isomers. ] DERIVATIVES phthal ate |ˈTHalˌāt |noun ORIGIN mid 19th cent.: phthalic, shortening of naphthalic (see naphthalene ).
phthalic anhydride
phthal ic an hy dride ▶noun Chemistry a crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes. [A bicyclic anhydride; chem. formula: C 6 H 4 (CO ) 2 O. ] ORIGIN mid 19th cent.: phthalic, shortening of naphthalic (see naphthalene ).
Oxford Dictionary
phthalic acid
phthalic acid |ˈ (f )θalɪk | ▶noun Chemistry a crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring. ●Chem. formula: C 6 H 4 (COOH ) 2; three isomers. ORIGIN mid 19th cent.: phthalic, shortening of naphthalic (see naphthalene ).
phthalic anhydride
phthal ¦ic an |hyd ¦ride ▶noun [ mass noun ] Chemistry a crystalline compound made by oxidizing naphthalene, used as an intermediate in the manufacture of plastics, resins, and dyes. ●A bicyclic anhydride; chem. formula: C 6 H 4 (CO ) 2 O. ORIGIN mid 19th cent.: phthalic, shortening of naphthalic (see naphthalene ).
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