ly·co·po·di·um 
(lī′kə-pōdē-əm)
(lī′kə-pōdē-əm)n.
1. A plant of the genus Lycopodium, which includes many of the club mosses.
2. The yellowish powdery spores of certain club mosses, especially Lycopodium clavatum, formerly used in fireworks and explosives and as a covering for pills.
[New Latin Lycopodium, genus name : Greek lukos, wolf; see wkwo- in the Appendix of Indo-European roots + Greek podion, diminutive of pous, foot; see ped- in the Appendix of Indo-European roots.]