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betel the dried leaf of this plant, chewed with the betel nut as a stimulant or narcotic. [1/2 definitions]
betel nut the nut of the betel palm, chewed together with betel pepper leaves and lime in southeastern Asia as a mild stimulant and narcotic.
caffeine a bitter substance that occurs naturally in coffee, tea, chocolate, and certain other substances and has stimulant and diuretic effects.
capsicum these pods or their seeds prepared, esp. dried, for use as a condiment or gastric stimulant. [1/2 definitions]
crystal the solid form of a stimulant drug, esp. methamphetamine. [1/7 definitions]
digitalis a heart stimulant derived from the dried leaves of the foxglove plant. [1/2 definitions]
guarana a substance containing caffeine and tannin that is made from the seeds of a South American shrub of the soapberry family, used as a stimulant. [1/2 definitions]
maté a stimulant beverage made from the leaves and shoots of a South American evergreen tree that is related to the holly. [1/2 definitions]
meth abbreviation of "methamphetamine"; a white crystalline drug derived from amphetamine that is a strong stimulant of the nervous system.
methamphetamine a white crystalline drug derived from amphetamine that is a strong stimulant of the nervous system.
pep pill (informal) a pill, tablet, or capsule containing a stimulant such as amphetamine.
stimulate to act as a stimulant or stimulus. [1/2 definitions]
strychnine a strongly poisonous white crystalline compound used to kill rodents and, in small doses, as a stimulant to the central nervous system.
theobromine a bitter, crystalline alkaloid related to caffeine, found in cacao plants, kola nuts, chocolate, and tea, and used as a diuretic and nerve stimulant.
upper (slang) a stimulant drug. [1/6 definitions]