Longman Dictionary of Contemporary English homepage

stimulant

 noun
     
Related topics: Drugs, Medicines
stim‧u‧lant [countable]
1MD a drug or substance that makes you feel more active and full of energy:
artificial stimulants
2 something that encourages more of a particular activity [= stimulus]:
economic stimulants
stimulant to
Increases in new construction would be a stimulant to the economy.
—stimulant adjective:
a drug with stimulant properties
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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