A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal. Often used in combination: pentahydrate.
Looking for online definition of hydration in the Medical
a substance that is formed when water combines with another substance. Source
: Merriam-Webster's Learner's
1: the act or process of combining or treating with water: asa: the introduction of
additional fluid into the body <
www.merriam-webster.com/dictionary/water of hydration
water that is chemically combined with a substance to form a
a compound, typically a crystalline one, in which water m... Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.