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1. caltrop
1. A four sided die (d4) popular in role-playing games like Dungeons & Dragons.
"Ouch, Tom. Put your caltrop back into your dice bag..."
by Jake Feb 6, 2005 add a video
2. caltrop
A metal ball that has 4 spikes arranged like the corners of a tetrahedron. Used for slowing calvalry. (The spikes stab into the horses hooves) I almost looks like a playing jack.
Sam layed the caltrops accross the roads and all the horses who ran through the road couldn't run anymore.
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