\Ex*cit"ant\, a. [L. excitans, -antis, p. pr. of
excitare: cf. F. excitant.]
Tending to excite; exciting.

\Ex*cit"ant\, n. (Physiol.)
An agent or influence which arouses vital activity, or
produces increased action, in a living organism or in any of
its tissues or parts; a stimulant.