Pronunciation: pr ō - ' päk-s ə - ˌ f ē n
Function: noun
Etymology: prop- + oxy + -phene (alter. of phenyl )
Date: 1955
: a narcotic analgesic C 22 H 29 NO 2 structurally related to methadone but less addicting that is administered especially in the form of its salts (as the hydrochloride)