NAPHTHOLS

Noun

naphthols

plural of naphthol

Source: Wiktionary

NAPHTHOL

Naph"thol, n. Etym: [Naphthalene + -ol.] (Chem.)

Definition: Any one of a series of hydroxyl derivatives of naphthalene, analogous to phenol. In general they are crystalline substances with a phenol (carbolic) odor. Naphthol blue, Naphthol orange, Naphthol yellow (Chem.), brilliant dyestuffs produced from certain complex nitrogenous derivatives of naphthol or naphthoquinone.

Source: Webster’s Unabridged Dictionary 1913 Edition

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