| 单词 | graptolite |
| 释义 | Word Frequency graptolite(ˈɡræptəˌlaɪt) noun any extinct Palaeozoic colonial animal of the class Graptolithina, usually regarded as related to either the hemichordates or the coelenterates: a common fossil, used to determine the age of sedimentary rocks Word origin C19: from Greek graptos written, from graphein to write + -lite |
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