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From Longman Dictionary of Contemporary Englishhalonha‧lon /ˈheɪlɒn $ -lɑːn/ noun [uncountable] technical  a compound gas that damages the ozone layer
Examples from the Corpus
halonFor example, environmental considerations have prompted the company to embark upon a halon replacement programme resulting in a range of alternative systems.The impending end of halon production is forcing the fire protection industry to consider recycling the halons already in use.It is expected that this halon replacement programme will continue to generate new business for the foreseeable future.
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