The Collaborative International Dictionary of English v.0.48:
Chafeweed \Chafe"weed`\, n. (Bot.) The cudweed (Gnaphalium), used to prevent or cure chafing. [1913 Webster]WordNet (r) 3.0 (2006):
chafeweed n 1: weedy perennial of north temperate regions having woolly foliage and dirty white flowers in a leafy spike [syn: chafeweed, wood cudweed, Gnaphalium sylvaticum]