Webster's English Dictionary

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sterilize

ster.il.ize \'ster-*-.li-z\ vt : to make sterile : as  : to cause (land) to 
   become unfruitful  : to deprive of the power of reproducing  : to make 
   incapable of germination  : to make powerless or useless  : to free from 
   living microorganisms  - ster.il.iz.er n