| abrasion [ǝ`brā·zhǝn] ENGINEERING 1. The removal of surface material from any solid through the frictional action of another solid, a liquid, or a gas or combination thereof. 2. A surface discontinuity brought about by roughening or scratching. GEOLOGY Wearing away of sedimentary rock chiefly by currents of water laden with sand and other rock debris and by glaciers. MEDICINE A spot denuded of skin, mucous membrane, or superficial epithelium by rubbing or scraping. |