What does aerosol mean?
An aerosol is, in everyday use, a sealed metal or plastic container holding a liquid or powder together with a pressurized propellant, so that pressing a valve releases the contents as a fine spray. Deodorants, paints, hairsprays, and cooking oils are all familiar examples sold in this form. In science, however, the word has a broader and older meaning: any suspension of minute solid particles or liquid droplets in a gas, whether produced artificially or occurring naturally — smoke, fog, sea salt, and volcanic ash are all atmospheric aerosols. This dual usage means context matters: a household speaker says 'grab an aerosol', while a climate scientist discusses how aerosols scatter sunlight and influence cloud formation. The term derives from Greek roots meaning air and solution, coined in the early twentieth century. Because aerosol cans once relied on chlorofluorocarbon propellants that damaged the ozone layer, the word also carries modern associations with environmental regulation and reformulation.
nounA substance enclosed under pressure and released as a fine spray, typically by means of a propellant gas; also, the container designed to dispense such a substance. In scientific contexts, it refers to a suspension of fine solid particles or liquid droplets in a gas.
- A pressurized container that releases its contents as a fine spray when a valve is pressed.
- The fine spray or mist itself, released from such a container.
- (Scientific) A colloidal suspension of fine solid particles or liquid droplets dispersed in a gas, especially in the atmosphere.
"She grabbed an aerosol of air freshener and gave the room a quick spray."
"Shake the aerosol well before use and hold it upright while spraying."
"Volcanic eruptions can inject vast quantities of aerosols into the stratosphere, temporarily cooling the planet."
Regular plural. In scientific writing, 'aerosols' often refers collectively to particulate matter suspended in the atmosphere rather than to multiple containers.
"Marine aerosols contribute significant amounts of salt to coastal rainfall."
The word 'aerosol' was coined in the 1920s for insect-spraying experiments — and today tiny atmospheric aerosols are among the biggest uncertainties in climate science.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aerosol
The word 'aerosol' is a twentieth-century coinage, formed from the Greek-derived prefix 'aero-' (air) combined with 'solution', first used in scientific contexts around the 1920s to describe airborne suspensions of particles. Its roots trace back to Greek 'aēr' (air) and Latin 'solvere' (to loosen or dissolve), making it cognate with words like 'aerial', 'aerate', and 'solvent'. The consumer sense — a pressurized spray can — developed from 1940s American insecticide dispensers and quickly spread worldwide.
How aerosol is actually used
In everyday British English, 'an aerosol' commonly refers to the pressurized can itself; American speakers more often say 'spray can' or simply 'spray'. In environmental science and physics, 'aerosol' carries a neutral technical meaning — a particle suspension in gas — with no implication of a consumer product. The plural is regular: aerosols.
Easily confused with aerosol
Arsole is an obscure organoarsenic chemical compound, whereas an aerosol is a pressurized spray or a suspension of particles in gas.