Existing or taking place within a vein; administered directly into the bloodstream through a vein.
From Latin 'intra' (within) plus 'venous' from 'vena' (vein). The term emerged in medical Latin during the development of modern medicine in the 17th-18th centuries as physicians better understood circulatory anatomy and developed injection techniques.
The first successful intravenous injection was performed on a dog in 1656 by Sir Christopher Wren (yes, the famous architect), who injected wine and ale into the animal's bloodstream using a quill and bladder. This groundbreaking experiment launched modern intravenous therapy, though it took centuries to become routine medical practice.
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