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hydroquinone
CIDE DICTIONARY
hydroquinone, n. [Hydro-, 2 + quinone.].
A white crystalline substance, C6H4(OH)2 , obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene . [1913 Webster]
OXFORD DICTIONARY
hydroquinone, n. a substance formed by the reduction of quinone, used as a photographic developer.
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