Wiktionary
n. Any of many cosmetic products that aim to improve the condition of the hair, especially after washing
Wikipedia
Hair conditioner is a hair care product that changes the texture and appearance of hair. Hair conditioners are often a viscous liquid that is applied to the hair and massaged into the hair. Hair conditioner is usually used after washing the hair with shampoo. Hair conditioners may contain moisturizers, oils and sunscreen, among other ingredients.
Usage examples of "hair conditioner".
A waste-paper basket held a collection of plastic bottles: shampoo, moisturizing cream, hair conditioner, hair colouring and a lot of screwed-up tissues and tufts of cotton wool.
She was holding a bottle of hair conditioner when he sniffed, as if he had a cold.
Shampoo, hair conditioner, skin conditioner, nail polish, a couple of dozen large bottles.
One of them's a hand cream and the other's hair conditioner, but they're all in there, along with a tube of Aloe Lip Preserver, some Cucumber Cleansing Milk, Honeyed Beeswax and Jojoba Oil Cleanser, Rhassoul Mud, Seaweed and Birch Shampoo, Rich Night Cream with Vitamin E, and a very great deal of cod liver oil.
The burly mechanic tried every new hair conditioner that came along, in an attempt to control his unruly light brown hair.