单词	excitant
释义	excitant /ˈɛksɪt(ə)nt / /ɪkˈsʌɪt(ə)nt / /ɛkˈsʌɪt(ə)nt/ noun Biology A substance which elicits an active physiological or behavioural response: what happens when chemical excitants flood into the brain?... Some people find that coffee brings out tremor; this is due to the presence of caffeine, which is an excitant; these effects are not, however, universal. The resulting synaptic inhibition is characterized by either a depressant or an excitant effect, depending on the population of cells involved.
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