naphthol
either of two isomeric hydroxyl derivatives, C10H7OH, 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.
Origin of naphthol
1- Also called hydroxynaphthalene.
Words Nearby naphthol
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use naphthol in a sentence
The substance has the characteristic appearance, odor and taste of naphthol.
This was observed when 6-amino-2-phenylbenzoselenazole was diazotized and coupled with B-naphthol, salicylic acid, etc.
The compounds formed are brilliant orange dyes, the latter being still largely consumed as “naphthol orange.”
Coal | Raphael MeldolaTheir discovery not only increased the consumption of beta-naphthol, but also that of the bases which were used for diazotising.
Coal | Raphael MeldolaIt is an amido-derivative of a sulpho-acid of beta-naphthol, so that naphthalene is the generating hydrocarbon of this substance.
Coal | Raphael Meldola
British Dictionary definitions for naphthol
/ (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: C 10 H 7 OH
Origin of naphthol
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for naphthol
[ năf′thôl′, -thōl′, năp′- ]
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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