Naphthol AS
nounDefinition of Naphthol AS
1 : a crystalline phenolic anilide HOC10H6CONHC6H5 used as a coupling component for azoic dyes; the anilide of 3-hydroxy-2-naphthoic acid
2 : any of a series of arylides of either ortho -hydroxy aromatic carboxylic acids (as 3-hydroxy-2-naphthoic acid) or acyl derivatives (as acetoacetic acid) of acetic acid used as coupling components for azoic dyes
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