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Adjective: excitatory  ik'sI-tu,to-ree [N. Amer], ik'sI-tu-t(u-)ree [Brit]
  1. (of drugs e.g.) able to excite or stimulate
    "The excitatory properties of caffeine can disrupt sleep patterns";
    - excitant, excitative

See also: stimulative

Encyclopedia: Excitatory