(|)hī|dräksē+...- noun
: any of several crystalline acids C 10 H 6 (OH)COOH derived from the naphthols: 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 dye table I (under Developer 8 ), 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