1. Aerosol definition, a system of colloidal particles dispersed in a gas and commonly formed as smoke, fog, mist, haze, or smog: a radioactive Aerosol;Aerosols in the stratosphere

2. Aerosol definition, a system of colloidal particles dispersed in a gas and commonly formed as smoke, fog, mist, haze, or smog: a radioactive aerosol;Aerosols in the stratosphere