| 单词 | θ43523 | 
| 释义 | the world > animals > mammals > 			[adjective]		 > of fossil or extinct types (6)		 thylacotherian1838 multituberculate1884 Of a tooth: bearing several cusps arranged in two or three rows. Also: of, relating to, or characteristic of the extinct order Multituberculata… tinoceratid1891 Of, pertaining to, or having the characters of the Tinoceras, a very large fossil mammal. synapsidan1903 synapsid1910 Of or pertaining to the subclass Synapsida, which includes fossil reptiles having a single temporal opening on each side of the skull. symmetrodont1950 Of or pertaining to an animal of this kind or the order including it. | 
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