phlebotomy

The removal of blood from a vein, usually with a needle and syringe or other container, for diagnostic or therapeutic purposes, as in the treatment of hemochomatosis.

The removal of blood from a vein with a cutting instrument, formerly done to reduce blood volume as a treatment of disease.

The act or practice of opening a vein for letting blood, as a remedy for disease or with a view to the preservation of health.

The act or practice of opening a vein for letting blood, in the treatment of disease; venesection; bloodletting.

The opening of a vein, either to withdraw blood or for letting blood; venesection.

surgical incision into a vein; used to treat hemochromatosis