n. The act of abrading; the act of wearing or rubbing off or away by friction or attrition.n. The result of rubbing or abrading; an abraded spot or place: applied chiefly to a fretting or excoriation of the skin by which the underlying tissues are exposed. In pathology, a superficial excoriation of the mucous membrane of the intestines, accompanied by loss of substance in the form of small shreds. The substance worn away by abrading or attrition.