咖啡因 Traditional form: 咖啡因 Pinyin (reading): kāfēiyīn Definitions: caffeine (loanword) Characters: 咖 - coffee; used in transliterations 啡 - coffee; morphine 因 - cause, reason; by; because Traditional characters: 咖 - coffee; used in transliterations 啡 - coffee; morphine 因 - cause, reason; by; because