- 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
单词 | graptolite |
释义 | WordReference Random House Unabridged Dictionary of American English © 2024 grap•to•lite (grap′tə līt′),USA pronunciation n.
Collins Concise English Dictionary © HarperCollins Publishers:: graptolite /ˈɡræptəˌlaɪt/ n
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