dowser
UK[ˈdaʊzə(r)]US[ˈdaʊzər]
n
A person who uses a divining rod or similar device to search for underground water, minerals, or other hidden substances.
Etymology
The term 'dowser' originates from the early 17th century verb 'dowse' or 'douse', meaning to use a divining rod. The etymology of this specific verb is obscure; it is not connected to the more common verb 'douse' meaning to plunge into liquid. It may derive from a dialectal word or be a distinct lexical item whose history is lost. The agent suffix '-er' was added to form a noun for the practitioner, following a standard English pattern. Thus, a 'dowser' is literally "one who dowses," a person who practices the art of finding hidden things, especially water, with a rod.
Analysis
The word 'dowser' is a simplex noun derived from the verb 'douse' (in its specific meaning of 'to use a divining rod') combined with the agent noun suffix '-er'. The verb 'douse' in this context is of uncertain origin, possibly related to a dialectal term.
Examples
The farmer hired a dowser to locate a spot for the new well.
Some people are skeptical about the methods used by a dowser.
In the old days, a dowser was a vital member of any community planning to dig for water.