a small whirlwind 10–100 feet (3–30 meters) in diameter and from several hundred to 1000 feet (305 meters) high, common in dry regions on hot, calm afternoons and made visible by the dust, debris, and sand it picks up from the ground.
a strong miniature whirlwind that whips up dust, litter, leaves, etc into the air
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009