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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 ?
Mohammad Bachal Korai delivered his second PhD Seminar on 'Spectrophotometer Determination of Cobalt, Nickle, Iron, Copper and Zing Using 1-(2- Thiazolylazo)-2 Napthol in Micellar Media' while, Mr.
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
* 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.
After incubation for 30 h at 28 [+ or -] 2[degrees]C at 140 rpm, one mL each of 5% a napthol and 40% KOH were added to the culture and mixed well.
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).
Not so Liz, arguably the best of the iconic Warhol silkscreen prints of the film star created in 1963, this one printed on a vibrant 'napthol red light' ground (Fig.
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.
The sample in a 13 by 100 mm test tube set on ice was reacted with 1 mL of 1 M NaOH, 0.5 mL of 1:1 (v/v) mixture of NaOH at 100 g [L.sup.-1] containing 20 mg thymine [mL.sup.-1] (prepared just before use) and napthol at 0.4 g [L.sup.-1] in ethanol at 950 mL [L.sup.-1], and 0.2 mL of a 1:5 (v/v) dilution of commercial bleach in distilled [H.sub.2]O prepared just before use.