hydration

noun

hy·​dra·​tion hī-ˈdrā-shən 

1

: the act or process of combining or treating with water: as

a

: the introduction of additional fluid into the body

hydration sometimes helps to reduce the concentration of toxic substances in the tissues

b

: a chemical reaction in which water takes part with the formation of only one product

hydration of ethylene to ethyl alcohol

especially : a reaction in which water takes part in the form of intact molecules

2

: the quality or state of being hydrated

especially : the condition of having adequate fluid in the body tissues