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caltrop noun

  /ˈkæltɹəp/ , /ˈkɔːltɹəp/
  • (weaponry) A small, metal object with spikes arranged so that, when thrown onto the ground, one always faces up as a threat to pedestrians, horses, and vehicles (also used as a heraldic charge).
 piede di corvo, tribolo
  • Any of a number of flowering plants in the family Zygophyllaceae, including several members of the genus Kallstroemia and the species Tribulus terrestris, native to warm temperate and tropical regions.
 tribulo comune
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