Caltrop Definition & Meaning | YourDictionary Caltrop definition: Any of various plants bearing small spiny fruits, especially of the genera <i>Tribulus</i> and <i>Kallstroemia.</i>.

Great suggestion, Owen.
And here's 'caltrop' definition (first entry) for people, like me, who may not know what this word means.
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www.yourdictionary.com/caltrop