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caltrop
noun
- an iron device with four spikes, placed on the ground so that one spike sticks up to hinder enemy cavalry
- a similar device used to puncture pneumatic tires
- any of a number of plants with spiny flowering parts or fruits; specif.,
- various plants (esp. Tribulus terrestris) of the caltrop family
- various plants of other families, as star thistle and water chestnut
adjective
designating a family (Zygophyllaceae) of dicotyledonous plants, shrubs, or trees (order Sapindales), including guaiacum, creosote bush, and bean caper
See caltrop in American Heritage Dictionary 4
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