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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.


(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 ?
Types of pigments: Blacks (carbon black), Blues (phthalocyanine), Greens (phthalocyanine), Reds (bon reds/maroon, lithol rubine, napthol red, perylene maroon, quinacridane red, quinacridane violet, red lake c, toluidine red), Yellow and oranges
Limited Tenders are invited for Dosuti Cotton Khadi of 70 cms wide to IS 3770--1994, amd--1,Variety No-2, Colour- Napthol Red
Napthol Reds--for all types of inks, coatings and plastics
While going southwards ( closer to the carbide plant), one would notice a pinkcoloured building ( formulation plant), a shed ( napthol plant), gas chambers and pipelines.
Cytospins (Shandon Cytospin 3) of freshly collected hemocytes ([less than or equal to] 50-100 [micro]1) from individuals with hemolymph that was normal (0% CCH), fully cancerous (100% CCH), or from CCH maintained in vitro were treated with the following stains and enzyme assays normally used to characterize human blood cells: Romanovsky stain (Thermo-Shandon, Kwik Diff stain kit), periodic acid-Schiff (PAS, Sigma 395-B), Sudan black B (SBB, Sigma 380-B), Oil red O (Humason, 1979), myeloperoxidase (MPO, Sigma 391-A), acid phosphatase (Sigma 181-A), alkaline phosphatase (Sigma 85L-1), and napthol AS-D chloroacetate (specific) esterase (Sigma 90-C2) and [alpha]-napthol acetate (non-specific) esterase (Sigma 90-A1).
Different salts of napthol red provide shades from the orange red to the blue red.
We used a napthol AS-MX phosphate-stabilized diazonium salt for demonstrating alkaline phosphatase activity (fast blue BB) and acid phosphatase activity (fast red violet LB).
Napthol and Carbolic AcidResorcinol:these chemicals help fix dye in hair but can cause central nervous system depression, are corrosive to the skin and are suspected carcinogens.
Two new organic pigments are Lansco 1370 Napthol Red 170, a product reported to equal competitive types at substantial cost savings, and Lansco 5151 Phthalo Blue 15:1.