noun \ˈnaf-ˌthl, ˈnap-, -ˌthōl\

Definition of NAPHTHOL

: either of two isomeric derivatives C10H8O of naphthalene found in coal tar or made synthetically: a : one used chiefly in synthesizing dyes—called also alpha-naphthol b : one used chiefly as an intermediate (as for dyes and pharmaceuticals) and especially formerly in medicine as an antiseptic and parasiticide—called also beta-naphthol

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