The Collaborative International Dictionary of English v.0.48:

Abrade \Ab*rade"\, v. t. [imp. & p. p. Abraded; p. pr. & vb.
   n. Abrading.] [L. abradere, abrasum, to scrape off; ab +
   radere to scrape. See Rase, Raze.]
   To rub or wear off; to waste or wear away by friction; as, to
   abrade rocks. --Lyell.
   [1913 Webster]