Nevile and Winther's acid
noun
Ne·vile and Win·ther's acid
ˈnāvəl,
ˈvintə(r)z-
: a crystalline phenolic sulfonic acid HOC10H6SO3H made by sulfonation of alpha-naphthol and used as a dye intermediate; 1-naphthol-4-sulfonic acid
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Merriam-Webster unabridged
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