caltrop

  1. Noun.  (weaponry) A small, metal object with spikes arranged so that, when thrown onto the ground, one always faces up as a threat to passers-by.
  2. Noun.  (colloquial) The starthistle, ''Centaurea calcitrapa'', a plant with sharp thorns.
  3. Noun.  A flowering plant, ''Tribulus terrestris'', in the family Zygophyllaceae, native to warm temperate and tropical regions of the Old World.

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This entry was last updated on RefTopia from its source on 3/20/2012.