a. (Chem.) Pertaining to, derived from, or related to, naphthalene; -- used to designate any one of a series of carboxyl derivatives, called naphthoic acids of the general formula C10H7.COOH, such as 1-naphthoic acid. [ 1913 Webster ]

n. [ Naphthalene + -ol. ] (Chem.) Any one of a series of hydroxyl derivatives of naphthalene, analogous to phenol. In general they are crystalline substances with a phenol (carbolic) odor. [ 1913 Webster ]

Naphthol blue,
Naphthol orange,
Naphthol yellow (Chem.), brilliant dyestuffs produced from certain complex nitrogenous derivatives of naphthol or naphthoquinone. [ 1913 Webster ]

n. [ Naphthalene + -ol. ] (Chem.) Any one of a series of hydroxyl derivatives of naphthalene, analogous to phenol. In general they are crystalline substances with a phenol (carbolic) odor. [ 1913 Webster ]

Naphthol blue,
Naphthol orange,
Naphthol yellow (Chem.), brilliant dyestuffs produced from certain complex nitrogenous derivatives of naphthol or naphthoquinone. [ 1913 Webster ]