in·ter·sti·tial /ˌɪntɚ/
  (a.)空隙的,裂縫的,有空隙的
  in·ter·sti·tial /ˌɪntɝˈstɪʃəl/ 形容詞
  間隙的,間質的,慢性間質性腎炎
  In·ter·sti·tial a. Of or pertaining to interstices; intermediate; within the tissues; as, interstitial cavities or spaces in the tissues of animals or plants.
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  interstitial
       adj : of or relating to interstices