Definition of excitant in US English:

excitant

noun

Biology
  • A substance which elicits an active physiological or behavioral response.

    • ‘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.’
    tonic, restorative, reviver, energizer, refresher
    View synonyms

Pronunciation

excitant

/ikˈsītnt//ɪkˈsaɪtnt/