| 单词 | tetrapod |
| 释义 | Word Frequency tetrapod(ˈtɛtrəˌpɒd) noun 1. any vertebrate that has four limbs 2. Also called: caltrop a device consisting of four arms radiating from a central point, each at about 109° to the others, so that regardless of its position on a surface, three arms form a supporting tripod and the fourth is vertical 3. engineering a very large cast concrete structure of a similar shape piled in large numbers round breakwaters and sea defence systems to dissipate the energy of the waves |
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