alphanaphthol

alpha-naphthol

[al-fuh-naf-thawl, -thol, -nap-]
noun Chemistry.
See under naphthol.
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naphthol

[naf-thawl, -thol, nap-]
noun Chemistry.
either of two isomeric hydroxyl derivatives, C 1 0 H 7 OH, 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:
1840–50; naphth- + -ol1

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World English Dictionary
naphthol (ˈnæfθɒl, ˈnæp-)
 
n
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]

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American Heritage
Medical Dictionary

naphthol naph·thol (nāf'thôl', -thōl', nāp'-) or naph·tol (-tôl, -tōl)
n.
An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol. Also called naphthalenol.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
naphthol   (nāf'thôl', -thōl', nāp'-)  Pronunciation Key 
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.
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