I. sham-ˈpü transitive verb
Etymology: Hindi & Urdu cā̃po, imperative of cā̃pnā to press, massage
Date: 1762
1. archaic : massage
2.
a. : to wash (as the hair) with soap and water or with a special preparation
b. : to wash the hair of
• sham·poo·er noun
II. noun
( plural shampoos )
Date: 1838
1. : an act or instance of shampooing
2. : a preparation used in shampooing