caltrops
noun(cal-trop)
star thistle
caltrops
noun(cal-trop)
puncture vine; also : any of various related herbs (genera Tribulus and Kallstroemia) of the same family (Zygophyllaceae, the caltrop family)
caltrops
noun(cal-trop)
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
caltrops
noun(cal-trop)
a widely naturalized spiny Old World knapweed (Centaurea calcitrapa) with purple flowers —called also caltrops
caltrops
noun(cal-trop)
any of various knapweeds related to the star thistle