Definition of transfusion

• n. - The act of transfusing, or pouring, as liquor, out of one vessel into another.
• n. - The act or operation of transferring the blood of one man or animal into the vascular system of another; also, the introduction of any fluid into the blood vessels, or into a cavity of the body from which it can readily be adsorbed into the vessels; intrafusion; as, the peritoneal transfusion of milk.