Definition of "alpha-naphthol" []

• An isomeric form of naphthol, C10H7OH, occurring as colorless or yellow prisms or powder, used in making dyes and perfumes and in organic synthesis. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "They are also called naphthol colours from the use of beta-and alpha-naphthol in their production."
• "With beta-naphthol, gives With alpha-naphthol, gives"
• "Primuline and 20 lb. salt, then diazotise and develop with alpha-naphthol."