From The Collaborative International Dictionary of English v.0.48:

Lycopodium \Ly`co*po"di*um\, n. [NL., from Gr. ? wolf + ?, ?, a
   foot.] (Bot.)
   A genus of mosslike plants, the type of the order
   Lycopodiace[ae]; club moss.
   [1913 Webster]

   Lycopodium powder, a fine powder or dust composed of the
      spores of Lycopodium, and other plants of the order
      Lycopodiace[ae]. It is highly inflammable, and is
      sometimes used in the manufacture of fireworks, and the
      artificial representation of lightning.
      [1913 Webster]
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