A decrease in the concentration of blood cells and other components due to an increase in blood plasma, often from fluid intake or medical transfusion.
From 'haemo-' (blood) + 'dilution' (from Latin 'diluere', to wash away). It describes the opposite of haemoconcentration—blood becomes thinner.
Athletes sometimes try 'blood doping' the opposite way through haemodilution—adding saline to thin their blood, though it's banned and doesn't actually work well.
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