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caltrop noun

  /ˈkaltɹəp/ , /ˈkæltɹəp/ , /ˈkɔːltɹəp/
  • (colloquial) The starthistle, Centaurea calcitrapa, a plant with sharp thorns.
василёк колючеголо́вый
  • (weaponry) A metal object, usually small, 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).
про́волочный ёж, чесно́к
  • 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.
я́корец назе́мный, я́корец сте́лющийся
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