The Collaborative International Dictionary of English v.0.48:
Excitatory \Ex*cit"a*to*ry\, a. [Cf. F. excitatoire.] Tending to excite; containing excitement; excitative. [1913 Webster]WordNet (r) 3.0 (2006):
excitatory adj 1: (of drugs e.g.) able to excite or stimulate [syn: excitant, excitative, excitatory]