Plural of transfusion; the medical process of putting blood from one person into another person's body to help them survive or recover.
From Latin 'transfundere' meaning 'to pour across,' from 'trans-' (across) and 'fundere' (to pour); originally used metaphorically before becoming a medical term.
The first successful blood transfusion happened in 1667 when a French doctor gave lamb's blood to a human patient (spoiler: it didn't go well)—it took until the 20th century to understand blood types and make the procedure reliably safe.
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