sphe·rom·e·ter /sfɪrˈɑmətɚ/
  球徑計
  sphe·rom·e·ter /sfɪrˈɑmətɚ/ 名詞
  Sphe·rom·e·ter n.  Physics An instrument for measuring the curvature of spherical surface, as of lenses for telescope, etc.
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  spherometer
       n : a measuring instrument for measuring the curvature of a
           surface