nicotine
US /ˈnɪk.ə.t̬iːn/
UK /ˈnɪk.ə.tiːn/
名词
尼古丁
a toxic colorless or yellowish oily liquid that is the chief active constituent of tobacco. It acts as a stimulant in small doses, but in larger amounts blocks the action of autonomic nerve and skeletal muscle cells. Nicotine is also used in insecticides.