A liquid preparation containing detergent or soap for washing the hair. She used a new shampoo to make her hair softer and shinier.
An act of washing the hair with shampoo. He gave his dog a thorough shampoo to remove the dirt and grime.
A session or treatment in which the hair is washed with shampoo, especially in a hairdressing salon. Your appointment includes a cut, colour, and a relaxing shampoo.