excitant

adjective

1. exciting; stimulating.

noun

2. Physiology. something that excites; a stimulant.

adjective Also: excitative (ɪkˈsaɪtətɪv), excitatory (ɪkˈsaɪtətərɪ, -trɪ)

1. able to excite or stimulate

noun

2. something, such as a drug or other agent, able to excite; stimulant