One of the mysteries of the English language finally explained.
Derogatory. A person who diagnoses illness on the basis of the visual inspection of urine, a uroscopist; (more generally) a quack. Compare "piss-prophet". In later use English regional (northern). Now historical.
Early 17th century; earliest use found in Thomas Dekker (c1572–1632), playwright and pamphleteer. From water + caster.
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