What is the act, process, or means of drawing off the pus or fluids from a wound, abscess, etc. Drainage tube (Surg.), a tube introduced into a wound, etc., to draw off the discharges called?

drainage — (Surg.) The act, process, or means of drawing off the pus or fluids from a wound, abscess, etc. Drainage tube (Surg.), a tube introduced into a wound, etc., to draw off the discharges. (Webster's 1913.)