Definition of hydroxynaphthoic acid
: any of several crystalline acids C10H6(OH)COOH derived from the naphthols: such as a : a yellow acid derived from beta-naphthol and used as an intermediate for azo dyes and pigments —called also beta-hydroxynaphthoic acid, 3-hydroxy-2-naphthoic acid — see naphthol as b : a white to reddish acid derived from alpha-naphthol and used as an analytical reagent —called also 1-hydroxy-2-naphthoic acid
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