Etymology
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shampoo (v.)

1762, "to massage, rub and percuss the surface of (the body) to restore tone and vigor," from Anglo-Indian shampoo, from Hindi champo, imperative of champna "to press, knead the muscles," perhaps from Sanskrit capayati "pounds, kneads." The thing is thoroughly described in "A Voyage to the East Indies" (1762).

The meaning "lather and wash the hair" is recorded by 1860; extended 1954 to carpets, upholstery, etc. Related: Shampooed; shampooing.

shampoo (n.)

1838, "act or operation of shampooing;" 1866, "soap for shampooing;" from shampoo (v.).

updated on August 03, 2022

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Definitions of shampoo from WordNet
1
shampoo (n.)
cleansing agent consisting of soaps or detergents used for washing the hair;
shampoo (n.)
the act of washing your hair with shampoo;
2
shampoo (v.)
use shampoo on (hair);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.