a thing that can be dangerous or cause damage a fire/safety hazard hazard (to somebody/something) Growing levels of pollution represent a serious health hazard to the local population. hazard (of something/of doing something) Everybody is aware of the hazards of smoking. hazard lights (= flashing lights on a car that warn other drivers of possible danger) Word Origin Middle English (originally referring to a certain gambling game): from Old French hasard, from Spanish azar, from Arabic az-zahr
‘chance, luck’, from Persian zār or Turkish zar ‘dice’.Extra examples Go in September if you want to avoid the hazard of extreme heat. Holes in the pavement are a hazard for blind people. Loneliness is one of the occupational hazards of being a writer. Other people’s smoke is now seen as a health hazard. Production of these chemicals poses serious environmental hazards. Stairs are a hazard for young children. The burning of industrial waste is a major hazard to human health. The rubbish under the flooring is a serious fire hazard. The worst hazard we faced was having our money stolen. Those piles of newspapers are a serious fire hazard. Try and reduce your exposure to hazards such as poor quality air. industrial hazards such as excessive noise and pollution Avoid foam-filled sofas—they are a serious fire hazard. Getting injured is an occupational hazard for athletes.