is·chi·um /ˈɪskiəm/
  坐骨
  is·chi·um /ˈɪskɪəm/ 名詞
  坐骨
  Is·chi·on Is·chi·um n.
  1. Anat. The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.
  2. Zool. One of the pleuræ of insects.
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  ischium
       n : one of the three sections of the hipbone; situated below the
           ilium [syn: ischial bone, os ischii]
       [also: ischia (pl)]