- Chemically, the addition of water; differentiated from hydrolysis, where the union with water is accompanied by a splitting of the original molecule and the water molecule.
- Clinically, the taking in of water; used commonly in the sense of reduced hydration or dehydration.
- The formation of a shell of water molecules around a molecular entity.
See Also: solvation
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Examples: glitazone, GI cocktail, etc.