Etymology
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perfusion (n.)

"a pouring through, a causing to permeate," 1570s, from French perfusion and directly from Latin perfusionem (nominative perfusio) "a pouring over," noun of action from past-participle stem of perfundere "pour out," from per "throughout" (from PIE root *per- (1) "forward," hence "through") + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour").

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Definitions of perfusion

perfusion (n.)
pumping a liquid into an organ or tissue (especially by way of blood vessels);
From wordnet.princeton.edu