• dowsing: to use a divining rod in an attempt to find underground water or minerals.
  http://www.wef.org/LearnAboutWater/ForThePublic/WaterTerms/#d



• the art of using a pendulum or stick to find the location of a person, place, or object. This technique can also be used to answer yes or no questions.
  http://members.aol.com/fadeddragn/dictionary.html



• The paranormal detection of underground water or mineral deposits (or lost persons and objects) using a divining rod or pendulum.
  http://www.wrexhamparaskeptics.4t.com/definitions.htm



• Dowsing: (divining, questing, water witching): The skill of divining for underground sources of water or other practical and spiritual matters by means of a divining rod or variety of other means, such as the pendulum, or even by device less techniques. Used to locate people, objects, or substances, and to diagnose illnesses.
  http://www.reiki.nu/treatment/healing/dictionary/dictionary.html#D



• dowsing: a method of locating subtle energies through the use of hand-held tools such as metal rods, forked tree branches, and pendulums of various types
  http://cropcircleconnector.com/ilyes/Intro3.html



• Divination to find a person, place, thing or element in buried in the earth. Dowsing will often involve using a pendulum (radiesthesia) or divining rod (rhabdomancy).
  http://www.divinitydice.com/dictionary.htm



• A divinatory device consisting of a string attached to a heavy object, such as a quartz crystal, root or ring. The free end of the string is held in the hand, the elbow steadied against a flat surface, and a question is asked. The movement of the heavy object's swings determines the answer. A rotation indicates yes or positive energy. A back and forth swing signals the opposite.
  http://magick-whispers.com/glossarypqrs.htm

Other names for dowsing include - Water Witching, Divining, Questing, Doodlebuging