ten·to·ri·um /-ɪəm/ 名詞
  (骨)幕,幕骨(昆蟲)
  Ten·to·ri·um n.  Anat. A fold of the dura mater which separates the cerebellum from the cerebrum and often incloses a process or plate of the skull called the bony tentorium.
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  tentorium
       n : (anatomy) a fold of dura mater that covers the cerebellum
           and supports the occipital lobes of the cerebrum