ETYM Latin stimulans, p. pr.; cf. French stimulant. Related to Stimulate.
That stimulates; SYN. stimulating.
Any substance that acts on the brain to increase alertness and activity; for example, amphetamine. When given to children, stimulants may have a paradoxical, calming effect. Stimulants cause liver damage, are habit-forming, have limited therapeutic value, and are now prescribed only to treat narcolepsy and severe obesity.