alpha naphthol

[al-fuh-naf-thawl, -thol, -nap-]

al·pha-naph·thol

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

[naf-thawl, -thol, nap-]
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.


Origin:
1840–50; naphth- + -ol1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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