CALTRAP
- any of several plants having spiny heads or fruit, as those of the genera Tribulus and Kallstroemia, or the star thistle, Centaurea calcitrapa
- 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, etc.
- a spiny plant, also CALTHROP, CALTROP [n -S]
- caltrop (a spiny plant) [n CALTRAPS]
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