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 (năf′thôl′, -thōl′, -thŏl′, năp′-) also naph·tol (-tôl, -tōl, -tŏl)
A hydroxy derivative of naphthalene, C10H8O, occurring in two isomeric forms: alpha-naphthol, used in making dyes and perfumes, and beta-naphthol, used in making antioxidants, pigments, dyes, and pharmaceuticals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈnæfθɒl; ˈnæp-)
(Chemistry) 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
[C19: from naphtha + -ol1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈnæf θɔl, -θɒl, ˈnæp-)

either of two isomeric hydroxyl derivatives, C10H7OH, of naphthalene: used chiefly in dyes, drugs, perfumes, and insecticides.
[1840–50; napth(a) + -ol1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.naphthol - either of two phenols derived from naphthalene
alpha-naphthol - an isomer of naphthol used in dyes
beta-naphthol - an isomer of naphthol used in rubber as an antioxidant
phenol - any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Types of pigments: Blues (phthalocyanine, triarylcarbonium); Greens (phthalocyanine, chromium); Reds (naphtol, quinacridone, BONA, triarylcarbonium, perylene, anthraquinone, benzimidazolone, DPP); Specialty (pearlescent); Yellow and oranges (monoazo, diarylide, isoindolinone, benzimidazolone, isacetoacetarylide, quinophthalone, lead Chromate, orange: naphthol, disazopryazalone, diarylide, benzimidazolone, perinone, azoheterocyclues, DPP)
To observe uptake of some dyes PAAm or PHA hydrogels were placed in aqueous solutions of cationic phenazine dyes such as Neutral Red, Safranin T and Janus Green, and the aqueous solutions of anionic dyes such as alizarin yellow R, eosin yellowish, naphtol green, bromocresol purple, congo red, indigo blue, and evans blue, and allowed to equilibrate for 2 days.
Staining for tartrate-resistant acid phosphatase (TRAP), as an exemplary enzymatic staining, was performed by incubation with a staining buffer (0.2 M sodium acetate 50 mM L+ tartaric acid, 1 mg/ml naphtol AS-MX phosphate, 1 mg/ml fast red TR salt, pH 5.0, all from Sigma-Aldrich) for 1 hour at 37[degrees]C.