Polyipsia is a medical symptom in which the patient drinks abnormally large amounts of fluids. The word derives from the Greek πολυδιψία, the feminine of πολυδίψιος (polydipsios), "very thirsty" and that from πολύς (polys), "much, many" + δίψα (dipsa), "thirst". The fluid is usually water, though some people may think of alcohol because of the etymologically related term dipsomaniac, meaning an alcoholic.