哌替啶 Traditional form: 哌替啶 Pinyin (reading): pàitìdìng Definitions: pethidine (aka meperidine or Demerol) (loanword) Characters: 哌 - used in transliterations 替 - to change, to replace, to substitute for 啶 - in chemistry, -dine Traditional characters: 哌 - used in transliterations 替 - to change, to replace, to substitute for 啶 - in chemistry, -dine