| 单词 | caltrop |
| 释义 | Word Frequency caltrop or caltrap (ˈkæltrəp) or calthrop (ˈkælθrəp) noun 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 Word origin Old English calcatrippe (the plant), from Medieval Latin calcatrippa, probably from Latin calx heel + trippa trap1 |
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