a. [f. L. excitāt- ppl. stem of excitāre (see EXCITATE) + -ORY.] Tending to or productive of excitation; characterized or produced by excitation.
1803. Med. Jrnl., IX. 147. Communication was produced between the two armatures by a silver wire or excitatory arc.
1874. Cooke, Fungi (1875), 58. Excitatory organs for the dehiscence of the asci.
1882. Nature, No. 637. 258. Changes in the electrical relations of the two surfaces [of a leaf] (called the excitatory variation). Ibid., XXVI. 353. The excitatory motions both of plants and of animals.
