caltrop

noun

cal·trop | \ ˈkal-trəp

How to pronounce caltrop (audio)

, ˈkȯl-\

variants: or less commonly calthrop \ ˈkal-thrəp

How to pronounce calthrop (audio)

, 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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