Answers

2014-05-14T11:25:58+05:30
A substance that raises levels of activity in the body or something tat increases active,interest or enthusiasm.
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2014-05-14T11:37:00+05:30
A substance that raises levels of physiological or nervous activity in the body.it is a "stimulant that has a direct effect on the nervous system".
tonic,restorative,reviver,refresher,etc..
"caffeine has stimulant effects on the heart".

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