American Heritage® Dictionary of the English Language, Fourth Edition
- n. Material suspended in the air in the form of minute solid particles or liquid droplets, especially when considered as an atmospheric pollutant.
- n. Any solid or liquid in a finely subdivided state, especially when considered as an atmospheric pollutant.
- n. a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)
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