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Caltanissetta

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• Calthrop

  any of several plants having spiny heads or fruit, as those of the genera Tribulus and Kallstroemia, or the star thistle, Centaurea calcitrapa. an iron ball with four projecting spikes so disposed that when the ball is on the ground one of them always points upward: used to obstruct the passage of cavalry, armored vehicles, […]

• Caltrop

  any of several plants having spiny heads or fruit, as those of the genera Tribulus and Kallstroemia, or the star thistle, Centaurea calcitrapa. an iron ball with four projecting spikes so disposed that when the ball is on the ground one of them always points upward: used to obstruct the passage of cavalry, armored vehicles, […]

• Caltrop-family

  the plant family Zygophyllaceae, typified by tropical herbaceous plants and shrubs having pinnate leaves, solitary or paired regular flowers, and fruit in the form of a capsule, and including the creosote bush, lignum vitae, and puncture vine.

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