— hydration , n.
/huy"drayt/ , n. , v. , hydrated, hydrating .
n.
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.
v.t. , v.i.
2. to combine chemically with water.
[ 1795-1805; HYDR- 1 + -ATE 2 ]