Correct spelling for the English word "narcyl" is [nˈɑːsɪl], [nˈɑːsɪl], [n_ˈɑː_s_ɪ_l] (IPA phonetic alphabet).
Trade name of ethylnarceine hydrochloride, antispasmodic; used in whooping-cough and asthma in doses of gr. 1 (0.06).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.