1 naphthol’s

[wuhn-naf-thawl, -thol, -nap-] /ˈwʌnˈnæf θɔl, -θɒl, -ˈnæp-/
noun, chemistry
see under naphthol.
[naf-thawl, -thol, nap-] /ˈnæf θɔl, -θɒl, ˈnæp-/
noun, chemistry
either of two isomeric hydroxyl derivatives, c 1 0 h 7 oh, of naphthalene (alpha-naphthol or 1-naphthol and beta-naphthol or 2-naphthol) white or yellowish crystals, with a phenolic odor, that darken on exposure to light: used chiefly in dyes, drugs, perfumes, and insecticides.
also called hydroxynaphthalene.
/ˈnæfθɒl; ˈnæp-/
a white crystalline solid having two isomeric forms, alpha-naphthol, used in dyes, and beta-naphthol, used in dyes and as an antioxidant. formula: c10h7oh
word origin
c19: from naphtha + -ol1

naphthol naph·thol (nāf’thôl’, -thōl’, nāp’-) or naph·tol (-tôl, -tōl)
an organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol. also called naphthalenol.
(nāf’thôl’, -thōl’, nāp’-)
a poisonous organic compound occurring in two isomeric forms. both isomers are important in the manufacture of dyes, and also in making antiseptics, insecticides, and tanning agents. naphthol consists of a hydroxyl group (oh) attached to naphthalene. chemical formula: c10h8o.

either of two colourless, crystalline organic compounds derived from naphthalene and belonging to the phenol family; each has the molecular formula c10h7oh. both compounds have long been identified with the manufacture of dyes and dye intermediates; they also have important uses in other areas of the chemical industry.
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