The Collaborative International Dictionary
Naphthyl
Naphthyl \Naph"thyl\, n. [Naphthalene + -yl.] (Chem.) A hydrocarbon radical regarded as the essential residue of naphthalene.
Wiktionary
naphthyl
n. (context organic chemistry English) Either of two isomeric univalent radicals formally derived from naphthalene by removal of a hydrogen atom
Usage examples of "naphthyl".
She was dripping naphthyl acid phosphate on small circles of white filter paper.