apoc·o·pe /əˈpɑkə(ˌ)pi/
  字尾音消失
  A·poc·o·pe, n.
  1. The cutting off, or omission, of the last letter, syllable, or part of a word.
  2. Med. A cutting off; abscission.
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  apocope
       n : abbreviation of a word by omitting the final sound or
           sounds; "the British get `pud' from `pudding' by apocope"