Forced or pushed a liquid (usually medicine) into something using a needle or syringe.
From Latin 'injectus,' past participle of 'inicere' (in- + iacere, 'to throw'). Literally means 'thrown into.' The term was applied to the medical practice of forcing liquids into the body, keeping the 'throwing' sense metaphorically.
The word 'inject' perfectly shows how Latin's 'iacere' ('to throw') spawned dozens of English words—inject, reject, project, trajectory—all about things being thrown or propelled. Medicine borrowed the metaphor to describe how vaccines and medicines forcefully enter the body.
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