radiesthesia
/ˌreɪdɪɪsˈθiːzɪə/ /ˌreɪdɪɪsˈθiːʒə/(also radiaesthesia)
noun
The (supposed) perception of energy or radiation by the body, proposed as the basis of the use of dowsing rods, pendulums, etc., especially to locate buried substances or diagnose illness; a branch of alternative medicine based on this.
Origin
1930s. From radio- + aesthesia, after French radiesthésie.