/nal"euhr feen', nal awr"feen/ , n. Pharm.
a white, crystalline, water-soluble powder, C 19 H 21 NO 3 , used to nullify respiratory depression due to narcotics and for the diagnosis of addiction to narcotics.
[ 1950-55; N-al ( lyln ) or ( mor ) phine; see ALLYL, NOR-, MORPHINE ]