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, etc.
Historical Examples

English Costume Dion Clayton Calthrop
The Religious Life of London J. Ewing Ritchie
The Religious Life of London J. Ewing Ritchie
Combed Out Fritz August Voigt
Combed Out Fritz August Voigt
Joan of Arc Laura E. Richards
Chronicles (1 of 6): The Description of Britaine Raphaell Holinshed

noun
any tropical or subtropical plant of the zygophyllaceous genera Tribulus and Kallstroemia that have spiny burs or bracts
water caltrop, another name for water chestnut (sense 1)
another name for the star thistle
(military) a four-spiked iron ball or four joined spikes laid upon the ground as a device to lame cavalry horses, puncture tyres, etc

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  • 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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