1a North American poplar with seeds covered in white cottony hairs.
Genus Populus, family Salicaceae: several species, including P. deltoides
2any of a number of downy-leaved Australasian shrubs:
an evergreen shrub of the buckthorn family (Pomaderris phylicifolia, family Rhamnaceae).a shrub of the daisy family (Bedfordia salicina, family Compositae).
cottonwood in other Oxford dictionaries
Definition of cottonwood in the US English dictionary
