Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


 (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.


(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]


(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]
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
References in periodicals archive ?
Pigments Offered: Blacks (carbon black); Blues (phthalo, ultramarine, milori); Corrosion Inhibiting (zinc and strontium based); Greens (phthalo, chromium oxide); Iron Oxide Pigments; Metallic Pigments (aluminum); Reds (metal salt azo, naphthol, DPP, quinacidone, rhodamine); Specialty Pigments (high performance pigments); Yellows and Oranges (diarylide, hansa, benz-imidazolone, lead chromate, moly orange); Whites (Ti[O.
The organic pigment types include the main classes of isoindolinone, azo condensation, quinacridone, dioxazine, dipyrrolopyrrole, perylene and some higher grade pigments of the naphthol and benzimidazole.
Pigments Offered: Blacks (carbon black); Blues (phthalocyanine); Greens (phthalocyanine); Reds (arylide red/maroon, BON red/maroon, lithol rubine, metallized azo red, naphthol red, quinacridone red, quinacridone violet, red Lake C, toluidine red); Yellows and Oranges (diarylide orange toner, diarylide yellow toner, hansa yellow, metallized azo yellow, dinitraniline orange).
A recognized leader in the supply of Diarylide yellows, Naphthol reds, 2B reds, Alkali blue and Carbazole Violets, we offer special grades of pigment for maximum transparency and gloss for packaging inks.
BASIC CHEMISTRY COLOR INDEX(ES) Red Lake C Pigment Red 53:1 Lithol Rubine Pigment Red 57:1 Red 2B Pigment Red 48:1 (Ba) & 48:2(Ca) Naphthol Reds Pigment Red 170, 188 & 210 Quinacridones Pigment Red 122,202 & 209, Pigment Violet 19 Perylenes Pigment Red 179, Pigment Violet 29 Carbazole Violet Pigment Violet 23 Indanthrene Pigment Blue 60 Phthalocyanine blue Pigments Blue 15:1, 15:3 & 15:6 (epsilon) Phthalocyanine Green Pigment Green 7 &; 36 Benzimidazolones Pigment Orange 36, Pigment yellows 151 & 154 Diarylide Yellows Pigment Yellow 17 & 83 Metal Complex yellows Pigment Yellow 139, 138, 194, 155, 185 DPP Pigment Red 254
Suppliers say we could be looking at 10 to 15 percent increases on beta naphthol and its derivatives by the third quarter.
Briefly, the MII oocytes were placed in a solution of 15 mg N-Phenyl-p-phenylene diamine (p-aminodiphenylamine), 15 mg naphthol AS-LG 0.
Types of pigments: Blacks (carbon black), Blues (basic dye pigments, phthalocyanine, indanthrone, quinacridone, PMA, PTA, methyl, tungstated), Greens (phthalocyanine, PMA, PTA), Reds (toluidine, naphthol, anthanthrone, DPP, manganese 2B, bon maroon, lithol rubine, antrhaquinone, quinacridone, alizarin, lithol rubine, perylene, rhodamine, robine red, AZO complex, bisacetoacetarylide), Yellows and Oranges (mono azo, diarylide, benzimidazolone, dispersion, bismuth vanadate, proprietary, dianisidine, dinitroaniline, hansa, isoindolinone, isoindoline, quinophthalone, naphthol, bisacetoacetarylide)
The strains were biotyped according to Williamson's classification [13] distinguishing 8 biotypes (A to H) based on the analysis of five enzymes: esterase (II), valine arylamidase (VI), naphthol phosphohydrolase (XI), a-glucosidase (XV), and N-acetyl- [beta]-D-glucosaminidase (XVII).
Fast red tablet dissolved in 5ml of naphthol phosphate and applied to sections for 10-20 minutes followed by washing in PBS and mounting.
Naphthol and Quinacridone Reds, Arylides, Diarylides and Isoindoline Yellows.
Key statement: A tire component comprising a rubber composition having a highly unsaturated diene elastomer and a reinforcing filler with a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof; a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof and a methylene donor.