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cal·trop | \ ˈkal-trəp 
, ˈkȯl- \
, ˈkȯl- \variants:
or less commonly calthrop \ ˈkal-thrəp , ˈkȯl- \
, ˈkȯl- \Definition of caltrop
1a caltrops also calthrops plural in form but singular or plural in construction : star thistle sense 1
b : puncture vine also : any of various related herbs (genera Tribulus and Kallstroemia) of the same family (Zygophyllaceae, the caltrop family)
2 : a device with four metal points so arranged that when any three are on the ground the fourth projects upward as a hazard to the hooves of horses or to pneumatic tires
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The first known use of caltrop was in the 15th century
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