| 单词 | caltrop |
| 释义 | caltrop n. (also caltrap) 1. hist. a four-spiked iron ball thrown on the ground to impede cavalry horses. 2. Heraldry a representation of this. 3. any creeping plant of the genus Tribulus, with woody carpels usu. having hard spines. Etymology: (sense 3) OE calcatrippe f. med.L calcatrippa: (senses 1-2) ME f. OF chauchetrape f. chauchier tread, trappe trap: ult. the same word |
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