EXCITANT Meaning of EXCITANT in English [ 'ɛksɪt(ə)nt , ɪk'sʌɪt(ə)nt , ɛk- ]■ noun Biology a substance which elicits an active physiological or behavioural response. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004