Webster's English Dictionary

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corrode

cor.rode \k*-'ro-d\ \-'ro-d-*-b*l\ vb [ME corroden, fr. L corrodere to gnaw 
   to pieces, fr. com- + (Xrodere to gnaw - more at RAT 1: to eat away by 
   degrees as if by gnawing; esp : to wear away gra dually usu. by chemical 
   action 2: CONSUME, IMPAIR  : to undergo corrosion  - cor.rod.ible aj