n. [ Gr. &unr_; sleepless; &unr_; to chase, search for + &unr_; sleep: cf. F. agrypnotique. ] Anything which prevents sleep, or produces wakefulness, as strong tea or coffee. [ 1913 Webster ]
[提神, tí shén, ㄊㄧˊ ㄕㄣˊ]to freshen up; to be cautious or vigilant; to watch out; stimulant to enhance mental performance; stay-awake drug; agrypnotic#23232[Add to Longdo]