海洛因 Traditional form: 海洛因 Pinyin (reading): hǎiluòyīn Definitions: heroin (loanword) Characters: 海 - sea, ocean; maritime 洛 - a river in the Shanxi province; a city 因 - cause, reason; by; because Traditional characters: 海 - sea, ocean; maritime 洛 - a river in the Shanxi province; a city 因 - cause, reason; by; because