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| grap·to·lite [ gráptə lt ] (plural grap·to·lites) |
noun |
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| Definition: |
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extinct sea creature: a small floating sea animal that lived in colonies between about 550 million and 325 million years ago and is now found as a fossil. Graptolite fossils are often used to date rocks. Orders Graptoloidea, Dendroidea.
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| [Mid-19th century. < Greek graptos, past participle of graphein "write"] |
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