nicotine /ˈnikti:n/ n. ［u］尼古丁：Many smokers who are chemically addicted to nicotine cannot cut down easily.许多有尼古丁瘾的抽烟人不容易把烟戒掉。The nicotine stains on his fingers told me he was under stress.他手指上的烟痕说明他压力很大。