naphthol

[ naf-thawl, -thol, nap- ]

/ ˈnæf θɔl, -θɒl, ˈnæp- /

noun Chemistry.

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.

Also called hydroxynaphthalene.

Origin of naphthol

First recorded in 1840–50; naphth- + -ol¹

Words nearby naphthol

naphtha, naphthacene, naphthalene, naphthalize, naphthene, naphthol, naphthol yellow S, naphthyl, naphthyl group, napier, napier grass

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for naphthol

Various additions have been made from time to time to the naphthol bath.
The Dyeing of Cotton Fabrics|Franklin Beech
The compounds formed are brilliant orange dyes, the latter being still largely consumed as “naphthol orange.”
Coal|Raphael Meldola
When this compound is combined with naphthol diazo-azo dyes are produced.
The Dyeing of Cotton Fabrics|Franklin Beech
So instead of phenol, other coal tar products such as cresol, naphthol or benzene itself may be used.
Creative Chemistry|Edwin E. Slosson

Naphthol Yellow is of course a naphthol colour, whilst Vermilline Scarlet is a dye containing both naphthylamine and naphthol.
The Chemistry of Hat Manufacturing|Watson Smith

British Dictionary definitions for naphthol

naphthol

/ (ˈnæfθɒl, ˈnæp-) /

noun

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

Word Origin for naphthol

C19: from naphtha + -ol 1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for naphthol

naphthol

[ năf′thôl′, -thōl′, năp′- ]

n.

An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol.naphthalenol

Scientific definitions for naphthol

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.

单词	naphthol
释义	naphthol [ naf-thawl, -thol, nap- ] / ˈnæf θɔl, -θɒl, ˈnæp- / noun Chemistry. 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. Also called hydroxynaphthalene. Origin of naphthol First recorded in 1840–50; naphth- + -ol¹ Words nearby naphthol naphtha, naphthacene, naphthalene, naphthalize, naphthene, naphthol, naphthol yellow S, naphthyl, naphthyl group, napier, napier grass Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for naphthol Various additions have been made from time to time to the naphthol bath. The Dyeing of Cotton Fabrics\|Franklin Beech The compounds formed are brilliant orange dyes, the latter being still largely consumed as “naphthol orange.” Coal\|Raphael Meldola When this compound is combined with naphthol diazo-azo dyes are produced. The Dyeing of Cotton Fabrics\|Franklin Beech So instead of phenol, other coal tar products such as cresol, naphthol or benzene itself may be used. Creative Chemistry\|Edwin E. Slosson Naphthol Yellow is of course a naphthol colour, whilst Vermilline Scarlet is a dye containing both naphthylamine and naphthol. The Chemistry of Hat Manufacturing\|Watson Smith British Dictionary definitions for naphthol naphthol / (ˈnæfθɒl, ˈnæp-) / noun 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 Word Origin for naphthol C19: from naphtha + -ol 1 Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for naphthol naphthol [ năf′thôl′, -thōl′, năp′- ] n. An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol.naphthalenol The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for naphthol 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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