comminution
  粉碎
  com·mi·nu·tion /ˌkɑməˈn(j)uʃən/ 名詞
  搗碎,粉碎,粉碎狀
  Com·mi·nu·tion n.
  1. The act of reducing to a fine powder or to small particles; pulverization; the state of being comminuted.
  2. Surg. Fracture (of a bone) into a number of pieces.
  3. Gradual diminution by the removal of small particles at a time; a lessening; a wearing away.
     Natural and necessary comminution of our lives.   --Johnson.
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