aerosolPronunciation: /ˈɛːrəsɒl/Translate aerosol | into French | into German | into Italian | into Spanish Definition of aerosol noun a substance enclosed under pressure and released as a fine spray by means of a propellant gas. a container holding an aerosol. Chemistry a colloidal suspension of particles dispersed in air or gas: the organisms are spread in the aerosols generated by showersOrigin: 1920s: from aero- + sol2aerosol in other Oxford dictionaries Definition of aerosol in the US English dictionary