Technically, an aerosol is a suspension of fine solid particles or liquid droplets in a gas. Examples are smoke, oceanic haze, air pollution, smog and CS gas. In general conversation, aerosol usually refers to an aerosol spray can or the output of such a can.
OmegaWiki Dictionary
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aerosol A gaseous suspension of ultramicroscopic particles of a liquid or a solid.\n(Source: MGH)
aerosol An aerosol can for applying paint, deodorant, etc., as a fine spray.