From Longman Dictionary of Contemporary Englishdowserdows‧er /ˈdaʊzə $ -ər/ noun [countable] BORFsomeone who dowses for water or minerals
Examples from the Corpus
dowser• Bearing in mind the cautions of Chapter 5, what have dowsers to tell us about sites and earth energies?• It is generally invisible, but can be detected by sensitives or dowsers.• Traditional rural dowsers used wooden sticks to locate underground water.• The dowsing response can tell as much about the dowser as about the site under investigation. 