naph·​thol | \ˈnaf-ˌthȯl, nonstandard ˈnap-, -ˌthōl\

Definition of naphthol 

1 : either of two isomeric derivatives C10H8O of naphthalene used as antiseptics and in the manufacture of dyes

2 : any of various hydroxy derivatives of naphthalene that resemble the simpler phenols

First Known Use of naphthol

1842, in the meaning defined at sense 1

History and Etymology for naphthol

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The first known use of naphthol was in 1842

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naph·​thol | \ˈnaf-ˌthȯl, ˈnap-, -ˌthōl\

Medical 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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the figure or shape of a crescent moon

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