| 单词 | dimetrodon |
| 释义 | dimetrodon /duy me"treuh don'/, n. an extinct carnivorous mammallike reptile, of the genus Dimetrodon, dominant in North America during the Permian Period, up to 10 ft. (3.1 m) long and usually bearing spinal sails. [ < NL (1878), equiv. to Gk dímetr(os) having two measures (see DIMETER) + odón tooth; appar. so named in reference to the large size of the anterior incisors relative to the other teeth] |
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