<unk>  (hypohydration) is the removal of water (hydro in ancient Greek) from an object. Medically, it is a condition in which the body contains an insufficient volume of water for normal functioning.
Dehydration
Third spacing of fluids
Water intoxication
Psychogenic polydipsia
Syndrome of inappropriate antidiuretic hormone
Stress hyperglycemia
Syndrome of inappropriate antidiuretic hormone surgery
Diabetic ketoacidosis