dipso-, -dipsia, -dipsy, -dipsias +

(Greek: thirst, thirsty [toward "drink"])

polydipsic
A reference to a chronic excessive thirst and intake of fluids.

It may be descriptive of an organic cause; such as, the dehydration of diabetes mellitus, diabetes insipidus, or a reaction to a medication, or it could be caused by some kind of psychological condition.

pseudodipsia
1. A false thirst or a thirst that is not satisfied by drinking water.
2. A thirst associated with a dry mouth but not with a bodily need for water.
psychogenic nocturnal polydipsia syndrome
Emotionally induced excessive water drinking at night.
psychogenic polydipsia
Excessive fluid consumption resulting from a disorder of the personality, without any demonstrable organic lesion (pathological or traumatic discontinuity of tissue or loss of the function of a body part).

Related "drink" units: bib-; haust-; nectar-; poto-.