/ ʃæmˈpuː; NAmE / noun , verb
■ noun ( pl. -os )
1.
[ C , U ] 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.
[ C , usually sing. ] 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 sb's hair)
■ verb
( sham·pooed , sham·pooed ) [ vn ] to wash or clean hair, carpets, etc. with shampoo
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WORD ORIGIN
mid 18th cent. (in the sense massage (as part of a Turkish bath process) ): from Hindi cāṃpo! press!, imperative of cāṃpnā .