tetrapod
/ˈtetrəpɒd/noun
1- Zoology a four-footed animal, especially a member of a group which includes all vertebrates higher than fishes【动】四足动物。
1.1
- Superclass Tetrapoda: the amphibians, reptiles, birds, and mammals四足动物总纲：两栖动物、爬行动物、鸟类和哺乳动物。
1.2
- an object or structure with four feet, legs, or supports（有四足支撑的）四脚物, 四脚结构。
词源
early 19th cent.: from modern Latin tetrapodus, from Greek tetrapous, tetrapod- 'four-footed'， from tetra- 'four' + pous 'foot'.