pneu·mat·o·phore /nʊˈmætəˌfor, njʊ, ˌfɔr/
  氣腔;呼吸根
  Pneu·mat·o·phore n.  Zool. One of the Pneumonophora.
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  pneumatophore
       n : an air-filled root (submerged or exposed) that can function
           as a respiratory organ of a marsh or swamp plant