Etymology
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polydipsia (n.)

in pathology, "excessive thirst," 1650s, from Greek polydipsios "very thirsty," from polys "much, many" (from PIE root *pele- (1) "to fill") + dipsa "thirst" (a word of unknown origin) + -ia "condition of."

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Definitions of polydipsia

polydipsia (n.)
excessive thirst (as in cases of diabetes or kidney dysfunction);
From wordnet.princeton.edu