Something that causes a concussion or violent shaking; an agent of shock or impact.
From Latin 'concussans,' present participle of 'concutere' (to shake together), combining 'con-' (together) and 'quatere' (to shake). The '-ant' suffix creates a noun for something that performs the action of shaking or impacting.
This is an incredibly rare word that appears mainly in 17th and 18th-century medical texts when doctors tried to classify every possible cause of injury using Latin terminology—it's almost never used today even by neurologists!
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