DICT.TW Dictionary Taiwan

 mort·main /ˈmɔrtˌmen/
 永久保管

 Mort·main n.  Law Possession of lands or tenements in, or conveyance to, dead hands, or hands that cannot alienate.
 Note: ☞ The term was originally applied to conveyance of land made to ecclesiastical bodies; afterward to conveyance made to any corporate body.
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 mortmain
      n 1: real property held inalienably (as by an ecclesiastical
           corporation) [syn: dead hand]
      2: the oppressive influence of past events of decisions [syn: dead
         hand, dead hand of the past]