Sentence:  "Congestive Chills."—Give from ten to fifteen drops of spirits of turpentine in a wineglass of toddy. Make a liniment of equal parts of turpentine and camphor. With this rub the spine, chest and <WSD>extremities</WSD> well; but not enough to blister. Rub the <WSD>extremities</WSD> until reaction takes place. A cloth saturated with the mixture should be applied to the chest. 
Meaning of the word marked with <WSD> tags:  A (wing). (from early 15th c.)