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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]