'Excitatory' definitions:

Definition of 'excitatory'

adjective

(of drugs e.g.) able to excite or stimulate [syn: excitant, excitative, excitatory]

From: GCIDE

Excitatory \Ex*cit"a*to*ry\, a. [Cf. F. excitatoire.] Tending to excite; containing excitement; excitative. [1913 Webster]