any of various plants having stems and leaves covered with a soft, hoary pubescence.
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How to use cottonweed in a sentence
Going two miles this morning, we came to a little stream called the Little cottonweed.Journal of a Trip to California | Charles W. Smith
British Dictionary definitions for cottonweed
a downy perennial plant, Otanthus maritimus, of European coastal regions, having small yellow flowers surrounded by large hairy bracts: family Asteraceae (composites)
any of various similar plants
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012