- 1[countable, uncountable] a liquid soap that is used for washing your hair; a similar liquid used for cleaning carpets, furniture covers, or a car a shampoo for greasy hair carpet shampoo
- 2[countable, usually singular] an act of washing your hair using shampoo Rinse the hair thoroughly after each shampoo. a shampoo and set (= an act of washing and styling someone's hair)
Check pronunciation: shampoo