A substance or device used to eliminate odors and make something smell pleasant or clean.
From English 'fresh' (Middle English, from Old French 'freis') plus the agent suffix '-ener'. The concept developed in the 20th century with commercial air fresheners and cleaning products.
The humble air freshener represents humanity's eternal battle against offensive odors, leading to a multi-billion dollar industry built on making things smell like pine forests, ocean breezes, and vanilla cookies. Interestingly, many fresheners don't actually eliminate odors but rather mask them or temporarily numb our smell receptors.
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