ca·lyp·tra /kəˈlɪptrə/
  帽狀體
  Ca·lyp·tra n.   Bot. A little hood or veil, resembling an extinguisher in form and position, covering each of the small flasklike capsules which contain the spores of mosses; also, any similar covering body.
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  calyptra
       n : the hood or cap covering the calyx of certain plants: e.g.,
           the California poppy