Naphthyl n. : A hydrocarbon radical regarded as the essential residue of naphthalene.

Example:
Molecular weight for Benzyle Naphthyl ether?

Taxonomy
naphthyl, Webster's New World College Dictionary, yourdictionary, pronunciation, dictionary, naphthalene, online dictionary, thesaurus, websters, synonyms, usage examples, quotes, naph, thyl, hil, monovalent, Etymology, alene.

Defination from the web:
naphthyl from Webster's New World College Dictionary. Meaning of naphthyl. Pronunciation of naphthyl. Definition of the word naphthyl. ... naphthyl. naphthyl definition. naph·thyl (-t̸hil) noun. a monovalent radical CH derived from naphthalene. Etymology: naphth(alene) + -yl ...