detrition

detrition (http://definr.com/detrition)

     n 1: erosion by friction [syn: abrasion, attrition, corrasion]
     2: the wearing down of rock particles by friction due to water
        or wind or ice [syn: grinding, abrasion, attrition]
     3: effort expended in rubbing one object against another [syn:
        friction, rubbing]