[al-fuh-naf-thawl, -thol, -nap-]
- See under naphthol.
[naf-thawl, -thol, nap-]
- 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
Also called hydroxynaphthalene.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for alpha-naphthol
Alpha-naphthol for dark reds from Primuline, greys from Diamine blues, Neutral grey, etc.
Practically the only phenol that is used is the beta-naphthol; alpha-naphthol is occasionally used, but not often.
- 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
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
naphthol(năf′thôl′, -thōl′, năp′-)
- 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.
[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.