tourniquet(n = noun.artifact) compression bandage - bandage that stops the flow of blood from an artery by applying pressure;
is a kind of bandage, patch

   An instrument for arresting hemorrhage. It consists essentially of a pad or compress upon which pressure is made by a band which is tightened by a screw or other means. [1913 Webster]

tourniquet, n. a device for stopping the flow of blood through an artery by twisting a bar etc. in a ligature or bandage.

Etymology:
F prob. f. OF tournicle coat of mail, TUNICLE, infl. by tourner TURN

N  stopper, stopple, plug, cork, bung, spike, spill, stopcock, tap, rammer, ram, ramrod, piston, stop-gap, wadding, stuffing, padding, stopping, dossil, pledget, tompion, tourniquet, cover, valve, vent peg, spigot, slide valve, janitor, doorkeeper, porter, warder, beadle, cerberus, ostiary.