sedative

1. N-COUNT A sedative is a medicine or drug that calms you or makes you sleep. 鎮(zhèn)靜劑

They use opium as a sedative, rather than as a narcotic. 他們把鴉片作爲(wèi)鎮(zhèn)靜劑，而不是作爲(wèi)麻醉劑。