in·i·on /ˈɪniˌɑn, ən/
  枕外隆凸尖
  in·i·on /ˈɪnɪˌɑn, ən/ 名詞
  枕外隆凸點
  In·i·on n.  Anat. The external occipital protuberance of the skull.
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  inion
       n : the craniometric point that is the most prominent point at
           the back of the head (at the occipital protuberance)