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1570s, from Middle 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" (see per) + fundere "pour" (see found (v.2)).
perfusion per·fu·sion (pər-fyōō'zhən)n.
The act of perfusing.
The injection of fluid into a blood vessel in order to reach an organ or tissues, usually to supply nutrients and oxygen.