Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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