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单词 Cryptozoon
释义 Cryptozoon
 /krip'teuh zoh"on/,  n.  
 an extinct genus of algae from Precambrian and Cambrian times, forming irregularly hemispherical fossil colonies composed of layers of limy precipitate.
 [1883; < NL; see CRYPTO-, -ZOON]
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更新时间:2024/9/22 13:33:48