Plural of conditioner; substances or devices that improve the condition or quality of something. Most commonly refers to hair care products that soften and protect hair.
From Latin 'condicio' (agreement, condition) via Old French. The hair care meaning emerged in the mid-20th century as cosmetic science developed products to 'condition' or improve hair texture after shampooing.
Hair conditioners work by using positively charged molecules that cling to negatively charged damaged hair, essentially using basic chemistry to smooth our locks. The concept expanded beyond hair care to air conditioners, fabric conditioners, and soil conditioners, all sharing the idea of improving existing conditions.
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