n 1 a  cap  :  a large genus of erect or creeping club mosses with evergreen one-nerved leaves in four to many ranks  b  :  any club moss of the genus Lycopodium  2  :  a fine yellowish flammable powder composed of lycopodium spores and used as a dusting powder for the skin and for the surface of hand-rolled pills and as a component of fireworks and flashlight powders .
 
 
 
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