The Collaborative International Dictionary of English v.0.48:

Corrade \Cor*rade"\ (k?r-r?d"), v. t. [L. corradere, -rasum;
   cor- + radere to rub.]
   1. To gnaw into; to wear away; to fret; to consume. [Obs.]
      --Dr. R. Clerke.
      [1913 Webster]

   2. (Geol.) To erode, as the bed of a stream. See Corrosion.
      [1913 Webster]

WordNet (r) 3.0 (2006):

corrade
    v 1: wear away [syn: abrade, corrade, abrase, rub down,
         rub off]