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tetrahydrate

[te-truh-hahy-dreyt]
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noun Chemistry.
  1. a hydrate that contains four molecules of water, as potassium sodium tartrate, KNaC4H4O6·4H2O.

Origin of tetrahydrate

First recorded in 1885–90; tetra- + hydrate
Related formstet·ra·hy·drat·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018