Transfusion

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late Middle English: from Latin transfusio(n- ), from the verb transfundere (see transfuse).

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transfusion (n.)

1570s, "action of pouring liquid from one vessel to another," from French transfusion and directly from Latin transfusionem (nominative transfusio) "a decanting, intermingling," noun of action from past-participle stem of transfundere "pour from one container to another," from trans "across, beyond" (see trans-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Sense of "transfering of blood from one individual to another" first recorded 1640s.