fe·nes·tra /fəˈnɛstrə/
  窗; 窗孔; 膜孔
  fe·nes·tra /fəˈnɛstrə/ 名詞
  窗孔(動)苔蘚蟲外卵室的非鈣化區,透明斑(動)
  Fe·nes·tra n.; pl. Fenestræ   Anat. A small opening; esp., one of the apertures, closed by membranes, between the tympanum and internal ear.
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  fenestra
       n : a small membrane-covered opening (especially one in the bone
           between the middle and inner ear)
       [also: fenestrae (pl)]