stimulant
nounUK /ˈstɪmjʊlənt/
US /ˈstɪmjələnt/
A stimulant is something that makes you feel more awake and full of energy.
Coffee contains a stimulant called caffeine.
OTHER MEANINGS
2. A substance that speeds up the activity of the body or mind.
Doctors warn that some stimulants can be addictive.
3. Something that encourages activity or growth.
The new park became a stimulant for the local economy.
4. A medicine that increases alertness and energy.
The patient was given a mild stimulant to stay awake.