| 单词 | tetrapod |
| 释义 | tetrapod /te"treuh pod'/, n. 1. any vertebrate having four limbs or, as in the snake and whale, having had four-limbed ancestors. 2. an object, as a caltrop, having four projections radiating from one central node, with each forming an angle of 120° with any other, so that no matter how the object is placed on a relatively flat surface, three of the projections will form a supporting tripod and the fourth will point directly upward. adj. 3. having four limbs or descended from four-limbed ancestors. [1820-30; < NL tetrapodus < Gk tetrapod- (s. of tetrápous) four-footed. (see TETRA-, -POD) + NL -us adj. suffix] |
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