nasion
  鼻根點; 鼻根中點
  na·si·on /ˈnezɪˌɑn/ 名詞
  鼻根點
  Na·si·on n.  Anat. The middle point of the nasofrontal suture.
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  nasion
       n : the craniometric point at the bridge of the nose where the
           frontal and nasal bones of the skull meet