The Collaborative International Dictionary of English v.0.48:

Poudre \Pou"dre\, n. [See Powder.]
   Dust; powder. [Obs.] --Chaucer.
   [1913 Webster]

   Poudre marchant [see Merchant], a kind of flavoring
      powder used in the Middle Ages. [Obs.] --Chaucer.
      [1913 Webster]