Webster's English Dictionary

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erode

erode \i-'ro-d\ vb [L erodere to eat away, fr. e- + rodere to gnaw - more 
   at (MRAT 1: to diminish or destroy by degrees :  1a: to eat into or away by 
   slow destruction of substance : CORRODE  1b: to wear away by the action of 
   water, wind, or glacial ice  1c: to cause to deteriorate or disappear as if 
   by eating or wearing away  2: to produce or form by eroding  : to undergo 
   erosion