What does excitant mean?
An excitant is something that stimulates or arouses activity, particularly within the nervous system or the body more broadly. Used mainly as a noun in physiology and medicine, it denotes an agent — such as caffeine, certain drugs, or a sensory impulse — that provokes heightened activity in cells, nerves, or organs. It can also function as an adjective meaning 'stimulating', though this use is uncommon today. The word carries a technical, somewhat formal register: doctors might describe a drug as a cardiac or nervous excitant, while everyday conversation would almost always prefer the more familiar term 'stimulant'. Derived from the Latin excitare, meaning to rouse or call forth, excitant belongs to the same family as excite and excitation. Though rare in casual speech, it remains valuable for precise scientific writing, where distinguishing agents that stimulate from those that depress matters. Its opposite is a depressant or sedative — a substance that quiets rather than rouses.
An agent or stimulus that excites or rouses physiological or nervous activity.
"Camphor was once valued in medicine as a general circulatory excitant."
Mostly found in medical, physiological, and pharmacological writing.
Tending to excite or stimulate; producing increased functional activity.
"The text described certain odours as excitant to the olfactory nerves."
Rare in modern usage; 'excitatory' is generally preferred in scientific contexts.
Regular plural, used when referring to multiple stimulating agents.
"Physicians advise patients to avoid dietary excitants before surgery."
Your morning coffee owes its kick to being an excitant — a word borrowed from Latin meaning literally something that 'calls out' your nerves.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of excitant
Excitant comes from the Latin excitare, meaning 'to rouse, awaken, or call out', formed from ex- ('out') combined with citare ('to summon, set in motion'), a frequentative of ciere ('to move, call'). The word entered English in the early modern period, initially carrying the general sense of 'rousing or stimulating' before settling into its primarily physiological use. It shares its root with a broad family including excite, excitation, incite, and cite, all tracing back to that same Latin verb of calling forth.
Related word forms
How excitant is actually used
The word is formal and largely confined to scientific, medical, or older literary writing; in everyday speech 'stimulant' has largely displaced it. As an adjective it is rare compared with the noun.
Easily confused with excitant
'Excitable' describes a person or thing easily aroused or stimulated, while 'excitant' names the agent that does the stimulating.