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单词 ptychodont
释义 ptychodont Palæont.|ˈptɪkəʊdɒnt|
[f. Gr. πτῠχή fold + ὀδούς, ὀδοντ- tooth.]
Having the crowns of the molar teeth folded, as in the fossil genus Ptychodus.
1890in Cent. Dict.
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