Pronunciation: (stim'yu-lunt),[key] —n. 1. Physiol.,Med.something that temporarily quickens some vital process or the functional activity of some organ or part: Adrenalin is a stimulant for the heart. 2. any food or beverage that stimulates, esp. coffee, tea, or, in its initial effect, alcoholic liquor.
3. a stimulus or incentive.
—adj. 1. Physiol.,Med.temporarily quickening some vital process or functional activity.
2. stimulating. Cf. depressant.