American Heritage® Dictionary of the English Language, Fourth Edition
- n. A colorless crystalline organic acid, C6H4(COOH)2, prepared from naphthalene and used in the synthesis of dyes, perfumes, and other organic compounds.
- n. organic chemistry Any of three isomeric aromatic organic dicarboxylic acids, C6H4(COOH)2; especially the ortho- isomer manufactured from naphthalene, used in the synthesis of dyes, perfumes and other compounds.
GNU Webster's 1913
- adj. (Chem.) a white crystalline substance, C6H4.(CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins.
- n. a colorless acid used to make dyes and perfumes
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