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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Plumy \Plum"y\, a.
      Covered or adorned with plumes, or as with plumes; feathery.
      "His plumy crest." --Addison. "The plumy trees." --J. S.
      Blackie.
      [1913 Webster]