shampooed; shampooing; shampoos
Definition of shampoo
(Entry 1 of 2)
2a
: to wash (something, such as hair) with soap and water or with a special preparation
b
: to wash the hair of
shampoo
noun
plural shampoos
Definition of shampoo (Entry 2 of 2)
1
: an act or instance of shampooing
2
: a preparation used in shampooing
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Merriam-Webster unabridged
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Time Traveler for shampoo
The first known use of shampoo was in 1762
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