• WordNet 3.6
    • v dehorn take the horns off (an animal)
    • v dehorn prevent the growth of horns of certain animals
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Webster's Revised Unabridged Dictionary
    • v. t Dehorn To deprive of horns; to prevent the growth of the horns of (cattle) by burning their ends soon after they start. See Dishorn. "Dehorning cattle."
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Century Dictionary and Cyclopedia
    • dehorn To remove the horns from (domestic cattle). Two tools are used in the operation, a saw and a clipper. The saw has a narrow web held in a frame and resembles a butcher's saw; the clipper has a chisel-shaped knife which moves in guides and is operated by a rack and segments controlled by a pivoted handle.
    • dehorn To saw off the ends of logs bearing the owner's mark and to put on a new mark.
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In literature:

Had they not been dehorned, they would have torn each other to pieces.
"My Antonia" by Willa Cather
An' he got blacker 'n thunder an' roared round like a dehorned bull.
"The Light of Western Stars" by Zane Grey
Dehorned and goaded on to trains and steamers.
"Beautiful Joe" by Marshall Saunders
Dehorned and goaded on to trains and steamers.
"Beautiful Joe" by by Marshall Saunders
Associated Words: cornification, cornute, dehorn, croche, gore, crocket.
"Putnam's Word Book" by Louis A. Flemming
But why did you say dehorn the cows?
"The Fat of the Land" by John Williams Streeter
Asshur's Bull hath fled Dehorned.
"The House of Rimmon" by Henry Van Dyke
Mr. Kellogg: Isn't it better to dehorn it and get some new shoots to graft?
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
When dehorning cattle with clippers or saw, it is well to remove about one-half inch of the flesh of the horn.
"The Veterinarian" by Chas. J. Korinek
The practice of dehorning has grown popular in many parts of the country.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture

In news:

Forest officials stand near a rare one-horn rhinoceros which was killed and dehorned by poachers at Karbi hills, near Kaziranga National Park, in the northeastern Indian state of Assam, Thursday, Sept 27, 2012.
A dehorned black rhinoceros followed by a calf at the Bona Bona Game Reserve in South Africa.
JOHANNESBURG (AP) — Police in South Africa say they've arrested three men — including a game ranger — they suspect shot seven rhinoceros to death and dehorned them.
Topping is also referred to as heading, stubbing or dehorning.
Photo dated August 3, 2012 at the Bona Bona Game Reseve, 200 kms southeast of Johannesburg shows a black dehorned rhinoceros followed by a calf.
Straight from the SIGARMS Custom Shop, these limited production P229 and P239 pistols have been put through a dehorning process to eliminate all sharp and rough edges.
A black dehorned rhinoceros walks at the Bona Bona Game Reseve, southeast of Johannesburg, on Aug 3 (Photo: By Stephane De Sakutin, AFP/Getty Images).
Avoid stressful procedures prior to transport (vaccination/dehorning).