1. To cause something to spread, to flush, or to flood through, over, or across another object; such as, a color, a light, a liquid, an aroma, etc.: "After the damaged fender of the car was repaired, it was perfused with paint so it was almost impossible to see any difference between it and the rest of the automobile."
2. To pass a fluid; such as, blood, through a bodily organ or tissue by circulating it through blood vessels or other channels within the body: "During the operation, the doctor perfused the patient's heart with a stimulant."
3. Etymology: from Latin perfundere, "to drench"; from per-, "through" + fundere, "to pour".