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 (kăl′trəp, kôl′-)
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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈkæltrəp) or




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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


or cal•trap

(ˈkæl trəp)

also cal•throp


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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
While, indeed, motorization triggers the progress of urban societies (Nijkamp & Rienstra, 1995), urbanization and economic growth also lead to higher travel demands and an escalation of motorization rates (Feng & Sun, 2013; Olszewski, 2007), that can result in externalities such as pollution, carbon dioxide emmissions, noise, death and injuries sustained by accidents, or traffic congestions leading to time lost in travel and delays on other forms of transportation, including public transportation (Button, 1990; Calthrop & Proost, 1998; De Borger & Wouters, 1998; Jain & Tiwari, 2016; Kraus, 1991; Newbery, 1998; Schafer & Victor, 1999; Talbi, 2017; Wang et al., 2017).
(12) In Fames Trumpet Soundinge (1589), a eulogy to Sir Walter Mildmay (a member of Queen Elizabeth's privy council and Chancellor of the Exchequer) and Sir Martin Calthrop (a former Lord Mayor of London), Robarts claims that the lack of a printed record of Mildmay and Calthrop's achievements sees England refusing to follow the excellent example set by ancient Rome and Greece of 'fram[ing] eloque[n]t Oracions in the deceaseds just co[m]mendation'.
These costs are considered an indirect WTP for individuals (Courant and Porter, 1981; Calthrop and Maddison, 1996).
Maddison, D., Pearce, D., Johansson, O., Calthrop, E., Litman, T., & Verhoef, E.
(8.) Maddison D, Pearce D, Johansson O, Calthrop E, Litman T, Verhoef E.
Diana Calthrop is an upper crust blonde beauty, one of many such young women who have been recruited into the secret services, who is attempting to infiltrate a pro-Nazi group who still want peace with Hitler.
As the two worlds collide, the two main characters - Diana Calthrop and DI Ted Stratton - find each other the only person they can trust.
For those with a sweet tooth, there is fudge from the Country Fudge Company, a relatively new business set up by former IT con-sultant Herman Mittelholzer and his wife Gail Calthrop in Here-fordshire in 2004.