To flow or leak out from a vessel into surrounding tissue; especially used to describe blood or fluid escaping from veins or arteries.
From Medieval Latin 'extravasare,' combining 'extra' (outside) + 'vas' (vessel), literally describing the escape of fluid from its proper vessel into surrounding areas.
When you get a bad bruise, blood has 'extravasated'—the tiny vessels burst and blood pools in the tissue, which is why bruises are red, then purple, then yellow as the body reabsorbs the leaked blood.
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