cation: a positively charged ion
ion: a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
diabetes insipidus: a rare form of diabetes resulting from a deficiency of vasopressin (the pituitary hormone that regulates the kidneys); characterized by the chronic excretion of large amounts of pale dilute urine which results in dehydration and extreme thirst