Pronunciation (UK) IPA (key): /ˈmɔː.fiːn/ (US) IPA (key): /ˈmɔrˌfin/ Audio (UK)(file) Noun Singular morphine Plural morphines (biochemistry) (drug) Morphine is a pain medication that is found naturally in opium. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads