radiesthetistn.

1957 V. D. Wethered Introd. Med. Radiesthesia & Radionics xiii. 130 A foreign radiesthetist travelling in a train on the Continent was able to diagnose accurately what a fellow traveller was suffering from.

1958 M. Spark Robinson 57 I number among my acquaintances distinguished psychometrists,..astral radiesthetists, [etc.].

1997 B. Rowlands Which? Guide Complementary Med. 210 A medical dowser or radiesthetist..uses a pendulum instead of a dowser's twig. He or she works from a sample or ‘witness’ of the patient, usually a strand of hair, nail clipping or spot of blood on a filter paper.