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plural halons
(organic chemistry) A hydrocarbon (more precisely haloalkane) in which one or more hydrogen atoms have been replaced by halogens quotations examples
The Renew is also free of polyvinyl chloride, asbestos, chlorofluorocarbons and halons.
2009 February 12, Azadeh Ensha, “A Cellphone That Is Made With the Environment in Mind”, in New York Times