'Naphthol' definitions:

Definition of 'naphthol'

(from WordNet)
noun
Either of two phenols derived from naphthalene

Definition of 'Naphthol'

From: GCIDE
  • Naphthol \Naph"thol\, 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]