Apedia

Caltrop 蒺藜 ˈkæltrəp Caltrap Calthrop ˈkælθrəp N Tropical

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蒺藜

[ˈkæltrəp]
or caltrap
or calthrop [ˈkælθrəp]
n
1) any tropical or subtropical plant of the zygophyllaceous genera Tribulus and Kallstroemia that have spiny burs or bracts
2)
- water caltrop
3) another name for the: star thistle
4) 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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