shampoo

Etymology

First recorded in 1762 as a verb meaning “to massage”,^[1][2] probably borrowed from Hindi चाँपो (cā̃po), imperative of Hindi चाँपना (cā̃pnā, “to press, knead”).^[3][2][4] The practice is described in A Voyage to the East Indies (1762).^[1]

The sense “to lather and wash the hair” is recorded by 1860, and the noun “soap for shampooing” by 1866.^[1]

References

1. [1] [2] [3] Harper, Douglas, Online Etymology Dictionary, https://www.etymonline.com
2. [1] [2] Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
3. [1] The American Heritage Dictionary of the English Language, Boston: Houghton Mifflin
4. [1] Wiktionary, the free dictionary, https://en.wiktionary.org