• WordNet 3.6
    • n chevaux-de-frise defensive structure consisting of a movable obstacle composed of barbed wire or spikes attached to a wooden frame; used to obstruct cavalry
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Century Dictionary and Cyclopedia
    • chevaux-de-frise Pieces of timber traversed with spikes of iron, or of wood pointed with iron, 5 or 6 feet long, used to defend a passage, stop a breach, form an obstaele to the advance of cavalry, etc. A similar contrivance is placed on the top of a wall to prevent persons from climbing over it. Also cheval-de-frise. See caltrop.
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In literature:

The more you insist, the more she erects bastions of ignorance, the more she isolates herself by chevaux-de-frise.
"The Petty Troubles of Married Life, Complete" by Honore de Balzac
Wires were stretched in all directions, and chevaux-de-frise erected beyond.
"For Name and Fame" by G. A. Henty
This was surrounded with barbed-wire entanglements and chevaux-de-frise.
"The Story of the Great War, Volume IV (of 8)"
The barbed-wire chevaux-de-frise are often covered by snow in a night and have to be renewed.
"The Story of the Great War, Volume V (of 8)"
Their progress was obstructed by chevaux-de-frise and other impediments.
"History of the Rise of the Huguenots" by Henry Baird
Chevaux-de-frise consist of beams in which are fixed a number of spears, sword-blades, &c., with the points projecting outwards on all sides.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
While the fort was thus menaced, the chevaux-de-frise had again proved inefficient.
"The Student's Life of Washington; Condensed from the Larger Work of Washington Irving" by Washington Irving
Galloway, to procure pilots to conduct the fleet up Delaware River and through the Chevaux de Frise.
"Familiar Letters of John Adams and His Wife Abigail Adams During the Revolution" by John Adams
The men in the pass twisted the pine-boughs and snagged the trunks to form a rough chevaux-de-frise.
"The Plowshare and the Sword" by Ernest George Henham