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pentahydrate

[pen-tuh-hahy-dreyt]
noun Chemistry.
  1. a hydrate that contains five molecules of water, as potassium molybdate, KMoO4⋅5H2O.
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Origin of pentahydrate

First recorded in 1915–20; penta- + hydrate
Related formspen·ta·hy·drat·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018