A chemical compound or pharmaceutical preparation designed to reduce fatigue or weariness.
From Greek a- (against) + kopē (fatigue) + the chemical suffix -pyrin or -pirin, possibly modeled on aspirin or other pharmaceutical naming conventions.
Acopyrin seems to be a made-up pharmaceutical name from the era when companies were inventing drugs faster than they could truly test them—it's the kind of optimistic name you'd see on turn-of-the-century bottles promising 'instant vigor.'
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