isth·mus /ˈɪsməs/
  地峽,峽部
  isth·mus /ˈɪsməs/ 名詞
  (藻)腰,峽
  Isth·mus n.; pl. Isthmuses   Geog. A neck or narrow slip of land by which two continents are connected, or by which a peninsula is united to the mainland; as, the Isthmus of Panama; the Isthmus of Suez, etc.
  Isthmus of the fauces. Anat. See Fauces.
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  isthmus
       n 1: a relatively narrow strip of land (with water on both sides)
            connecting two larger land areas
       2: a narrow band of tissue connecting two larger parts of an
          anatomical structure
       [also: isthmi (pl)]