pros·the·sis /prɑsˈθisəs, ˈprɑsθə-/
  彌補,添字首音
  pros·the·sis /prɑsˈθɪsəs, ˈprɑsθə-/ 名詞
  修復術,假體(眼,牙,肢等)
  Pros·the·sis n.
  1. Surg. The addition to the human body of some artificial part, to replace one that is wanting, as a log or an eye; -- called also prothesis.
  2. Gram. The prefixing of one or more letters to the beginning of a word, as in beloved.
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  prosthesis
       n : corrective consisting of a replacement for a part of the
           body [syn: prosthetic device]
       [also: prostheses (pl)]