tumbleweed
Concise Oxford English Dictionary © 2008 Oxford University Press:
tumbleweed/ˈtʌmblwiːd/
▶noun N. Amer. & Austral./NZ a plant of arid regions which breaks off near the ground in late summer, forming light spherical masses blown about by the wind. [Several species in the genera Salsola and Amaranthus.]
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