Webster's English Dictionary

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abrade

abrade \*-'bra-d\ vb [L abradere to scrape off, fr. ab- + radere to scrape 
   - mor]e at RAT 1a: to rub or wear away esp. by friction : ERODE  1b: to 
   irritate or roughen by rubbing  2: to wear down in spirit : IRRITATE  : to 
   undergo abrasion  - abrad.er n