The Collaborative International Dictionary of English v.0.48:

Corrasion \Cor*ra"sion\ (k?r-r?"zh?n), n. [See Corrade.]
   (Geol.)
   The erosion of the bed of a stream by running water,
   principally by attrition of the detritus carried along by the
   stream, but also by the solvent action of the water.
   [1913 Webster]

WordNet (r) 3.0 (2006):

corrasion
    n 1: erosion by friction [syn: abrasion, attrition,
         corrasion, detrition]