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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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