止し痛つう剤ざいMeanings1nounpainkiller; analgesicrare termRare synonym for 鎮痛剤. The glosses 'sedative' and 'tranquilizer' are less precise; this term primarily refers to pain relief.See also: 鎮痛剤「止し痛つう剤ざい」は「鎮ちん痛つう剤ざい」のまれな異い表ひょう記きで、同おなじ意い味みです。止痛剤 is a rare variant spelling of 鎮痛剤 and means the same thing.