• WordNet 3.6
    • n alpha-naphthol an isomer of naphthol used in dyes
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Century Dictionary and Cyclopedia
    • n alpha-naphthol A naphthol having the hydroxyl-group in the alpha position.
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In literature:

They are also called naphthol colours from the use of beta-and alpha-naphthol in their production.
"The Dyeing of Cotton Fabrics" by Franklin Beech
It also gave the test for rhamnose with alpha-naphthol.
"Some Constituents of the Poison Ivy Plant: (Rhus Toxicodendron)" by William Anderson Syme