Sentence:  His forefathers had been, as a rule, professional men&mdash;physicians and lawyers; his grandfather died under the walls of Chapultepec Castle while twisting a <WSD>tourniquet</WSD> for a cursing dragoon; an uncle remained indefinitely at Malvern Hill;nb.... 
Meaning of the word marked with <WSD> tags:  A tightly-compressed bandage used to stop bleeding by stopping the flow of blood through a large artery in a limb.