naphthol

naph·thol

noun \ˈnaf-ˌthȯl, ˈnap-, -ˌthōl\

Definition of NAPHTHOL

: either of two isomeric derivatives C₁₀H₈O of naphthalene found in coal tar or made synthetically: a : one used chiefly in synthesizing dyes—called also alpha-naphthol b : one used chiefly as an intermediate (as for dyes and pharmaceuticals) and especially formerly in medicine as an antiseptic and parasiticide—called also beta-naphthol