Hydrate

[hahy-dreyt] /ˈhaɪ dreɪt/

noun
1.
any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na 2 CO 3 ⋅10H 2 O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO 3 ⋅H 2 O, or H 2 SO 4 , it is strongly held as water of constitution.
verb (used with or without object), hydrated, hydrating.
2.
to combine chemically with water.
/ˈhaɪdreɪt/
noun
1.
a chemical compound containing water that is chemically combined with a substance and can usually be expelled without changing the constitution of the substance
2.
a chemical compound that can dissociate reversibly into water and another compound. For example sulphuric acid (H2SO4) dissociates into sulphur trioxide (SO3) and water (H2O)
3.
(not in technical usage) a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one
verb
4.
to undergo or cause to undergo treatment or impregnation with water
n.

1802, “compound of water and another chemical,” from French hydrate, coined c.1800 by French chemist Joseph-Louis Proust (1754-1826) from Greek hydr-, stem of hydor “water” (see water (n.1)).
v.

1850, “to form a hydrate;” 1947 as “to restore moisture;” from Greek hydr-, stem of hydor “water” (see water (n.1)) + -ate (2). Related: Hydrated; hydrating.

hydrate hy·drate (hī’drāt’)
n.
A solid compound containing water molecules combined in a definite ratio as an integral part of a crystal. v. hy·drat·ed, hy·drat·ing, hy·drates

hydrate
(hī’drāt’)
Noun A compound produced by combining a substance chemically with water. Many minerals and crystalline substances are hydrates.

Verb