What does antifog mean?
Antifog refers to any substance or treatment designed to stop condensation — commonly called fog — from forming on transparent surfaces such as eyeglasses, swim goggles, camera lenses, mirrors, windshields, and protective visors. Condensation occurs when warm, moist air meets a cooler surface, scattering light and obscuring vision; antifog products work chiefly by reducing surface tension so moisture spreads into an even, transparent film instead of light-scattering droplets. In everyday use, "antifog" most often appears as a modifier — antifog spray, antifog wipes, antifog coating — describing consumer products sold to swimmers, divers, skiers, laboratory workers, and drivers. The word is functional and commercial rather than literary, but it names a genuinely useful category of technology: without antifog treatments, everything from surgical masks to astronaut helmet visors would be far more prone to dangerous clouding. Its hyphenated variant "anti-fog" is equally standard.
noun (also used attributively as an adjective)A substance or treatment applied to glass, lenses, mirrors, or other surfaces to prevent the formation of condensation (fog) on them.
- A chemical agent, spray, film, or coating that prevents condensation from forming on a transparent surface such as a lens, mirror, or visor.
"She wiped a drop of antifog across her swim goggles before diving into the pool."
"Divers apply antifog to their masks before every dive so the glass stays clear underwater."
"The new safety goggles come with a factory-applied antifog coating that lasts for months."
Rarely used in the plural; the word almost always appears as a mass noun or attributive modifier.
"The store stocks several antifogs, from sprays to reusable wipes."
The same chemistry that keeps your swim goggles clear also keeps astronauts' visors and surgeons' masks from clouding over at the worst possible moment.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of antifog
The word is a straightforward modern compound of the prefix "anti-", from Greek "anti" meaning "against", and "fog", a word of uncertain origin that appeared in English around the sixteenth century, possibly from Old Norse or Danish. As a compound, "antifog" belongs to the productive family of "anti-" coinages such as "antifreeze" and "antiseptic", formed in English to name substances that counteract something undesirable. It emerged in the twentieth century alongside the commercial products it describes, particularly as plastics and coated optics became widespread.
Related word forms
How antifog is actually used
"Antifog" is most often used attributively before a noun (antifog spray, antifog coating, antifog goggles) rather than standing alone. It is a practical, commercial term common in product descriptions for eyewear, sports gear, automotive products, and safety equipment; it carries no emotional connotation. The spelling "anti-fog" with a hyphen is equally acceptable and appears frequently in British usage.
Easily confused with antifog
A defogger actively removes existing fog or condensation (as in a car's rear-window defogger), whereas antifog prevents fog from forming in the first place.