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The general term for dry atmospheric suspensoids, including dust, haze, smoke, and sand.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Dry particles such as dust, haze, smoke, and sand, suspended in the air.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved