caltrop

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Related to Caltrops: water caltrops

cal·trop

 (kăl′trəp, kôl′-)
n.
2. Any of various plants bearing small spiny fruits, especially of the genera Tribulus and Kallstroemia.
3. A metal device with four projecting spikes so arranged that when three of the spikes are on the ground, the fourth points upward, used as a hazard to pneumatic tires or to the hooves of horses.

[Middle English calketrappe, from Norman French and from Old English calcatrippe, thistle, both from Medieval Latin calcatrippa, thistle : possibly from Latin calcāre, to tread on; see calque + trappa, trap (of Germanic origin).]

caltrop

(ˈkæltrəp) or

caltrap

;

calthrop

(ˈkælθrəp)
n
1. (Plants) any tropical or subtropical plant of the zygophyllaceous genera Tribulus and Kallstroemia that have spiny burs or bracts
2. (Plants) water caltrop another name for water chestnut1
3. (Plants) another name for the star thistle
4. (Military) military a four-spiked iron ball or four joined spikes laid upon the ground as a device to lame cavalry horses, puncture tyres, etc
[Old English calcatrippe (the plant), from Medieval Latin calcatrippa, probably from Latin calx heel + trippa trap1]

cal•trop

or cal•trap

(ˈkæl trəp)

also cal•throp

(-θrəp)

n.
1. any of several plants having spiny heads or fruit, as those of the genera Tribulus and Kallstroemeria.
2. an iron ball with four projecting spikes, one of which always points upward when the ball is placed on the ground: used to obstruct cavalry, vehicles, etc.
[before 1000; Middle English calketrappe, Old English calcatrippe]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.caltrop - tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutletscaltrop - tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed
genus Tribulus, Tribulus - annual or perennial herbs or subshrubs of warm regions
subshrub, suffrutex - low-growing woody shrub or perennial with woody base
2.caltrop - a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruitscaltrop - a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
genus Trapa, Trapa - small genus of Eurasian aquatic perennial herbs: water chestnut
Jesuits' nut, Trapa natans, water caltrop - a variety of water chestnut
ling, ling ko, Trapa bicornis - water chestnut whose spiny fruit has two rather than 4 prongs
aquatic plant, hydrophyte, hydrophytic plant, water plant - a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
3.caltrop - Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
centaury - any plant of the genus Centaurea
References in classic literature ?
'Arms: Azure, three caltrops in chief over a fess sable.
They could have also been used when riding into battle as horses wearing them would have avoided painful caltrops devices scattered to make a horse lame, or for better traction on ice and mud.
They could have also been used for offensive purposes, for example, riding into battle wearing these would have avoided painful caltrops devices scattered to make a horse lame, or for better traction on ice and mud.
They range from basic six-inch nails found embedded in the ground, to homemade caltrops - also known as crow's feet - similar to those once scattered on battlefields to halt advancing calvary.
Dash added new scenarios, designing for hostility: caltrops, explosives, malware.
(2) Classic A2/AD methods have been aimed at denying a human operator access to some location; scenarios ranged from medieval caltrops stopping a cavalry charge to the use of various forms of land mines.
Tire deflation Caltrops spikes would be very effective.
Most recently Heppell has pressed home the evolutionary interactionist paradigm and, in Freemanesque style, arranges his defensive caltrops against incursions into the anthropological territory of the Iban, so that an extended appendix is devoted exclusively to a criticism of Gavin, who is seen as the insufficiently trained and culturally unaware intruder (Heppell 2014: Appendix 1, 149-69).
(https://www.amazon.com/ASR-Tactical-Puncturing-Security-Caltrop/dp/B016E8Q04G) Caltrops , spikes closely resembling ninja stars, have been left across town, puncturing some 100 tires, (http://www.sierrasun.com/news/crime/close-to-100-south-tahoe-tires-punctured-by-ninja-star-like-devices/) reported the Tahoe Daily Tribune  last week.
Items available for requisition included (clockwise from top left) a Silenced Barrel to fit an M3 "grease gun" submachine gun and render it inaudible; the Fairbairn-Sykes Fighting Knife, with its adaptable scabbard that allowed it to be strapped onto almost any part of the body, at any angle; Tire-Puncturing Spikes, basic caltrops that could temporarily disable an enemy vehicle ("very effective when scattered in the gravel, dirt, or ruts of roads and airplane runways"); and the deadly sounding Smatchet, "a heavy, well-balanced close combat weapon combining the features of the machete and bolo."
Marines saw them as helping minimize civilian casualties, while countering looters and rioters, who sought credit for "driving the Americans back into the sea." (16) Marine reservists, who used them in law enforcement, trained Marines to use oleoresin capsicum "pepper" spray; non-lethal shotgun rounds; non-lethal grenades projecting small rubber balls; road spikes or "caltrops"; and other devices.
Amongst these might be mentioned a variegated form of the Red Goosefoot, Chenopodium rubrum, L., and the Caltrops, Tribulus terrestris, L.