• WordNet 3.6
    • n dowser forked stick that is said to dip down to indicate underground water or oil
    • n dowser someone who uses a divining rod to find underground water
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Webster's Revised Unabridged Dictionary
    • Dowser A divining rod used in searching for water, ore, etc., a dowsing rod.
    • Dowser One who uses the dowser or divining rod.
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Century Dictionary and Cyclopedia
    • n dowser See douser.
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Chambers's Twentieth Century Dictionary
    • n Dowser a water diviner
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In literature:

The instinct of an infallible dowser possessed him, and he made no mistakes.
"Three John Silence Stories" by Algernon Blackwood
Have you ever heard of a dowser?
"Talents, Incorporated" by William Fitzgerald Jenkins
A list of the names of "dowsers" is also given.
"Psychic Phenomena" by Edward T. Bennett
It should be added that dowsers do not always use any rod.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
That the twisting of the forked twig, or so-called divining rod, is due to involuntary muscular action on the part of the dowser.
"The Book of Buried Treasure" by Ralph D. Paine
Run to the wheel, or whoever it is will be there first, and take a dowser into the lower bole.
"Sweet Mace" by George Manville Fenn
It goes without saying that professional dowsers are not always successful in their quests.
"Occultism and Common-Sense" by Beckles Willson

In news:

"When the rod responds, it twists and points downward," says Nathan Platt, of the American Society of Dowsers (yes, there is such a thing).