Conditioner
(noun)
- A substance used to improve the condition of hair or skin.
- A device used to control the temperature or humidity of air.
Origin:
Late 19th century: from condition + -er.
Examples:
- She uses a leave-in hair conditioner to keep her hair soft and shiny.
- He uses a deep conditioner to repair his damaged hair.
- The air conditioner controls the temperature and humidity of the room.
- The conditioning unit maintains the temperature and humidity of the greenhouse.
- The conditioning system controls the temperature and humidity of the building.