[C, U] a liquid soap that is used for washing your hair; a similar liquid used for cleaning carpets, furniture covers or a car 洗发水；洗发露；（洗地毯、家具罩套、汽车等的）洗涤剂
a shampoo for greasy hair
油性头发洗发剂
carpet shampoo
地毯洗涤剂
[C, usually singular] an act of washing your hair using shampoo 用洗发剂洗头发
Rinse the hair thoroughly after each shampoo.
每次用洗发剂洗发后都要彻底冲干净。
a shampoo and set (= an act of washing and styling sb’s hair)
洗头发并做发型
verb
~ sth to wash or clean hair, carpets, etc. with shampoo 用洗发剂洗（头发）；用洗涤剂洗（地毯等）