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n :  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 esp. formerly in medicine as an antiseptic and parasiticide - called also beta-naphthol  .
Similar sounding terms:  naph·thyl 

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