- noun a quantity of tiny particles of liquid suspended in a gas under pressure, sprayed from a container
- noun a can of liquid with a propellant gas under pressure, which is used to spray the liquid in the form of tiny drops
- noun a quantity of tiny particles of liquid or powder which stay suspended in the atmosphere
- A suspension of solid or liquid particles in a gas. Aerosols are encountered in planetary atmospheres, including those of the Earth and Mars.
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