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Definition of graptolite
: any of an extinct class (Graptolithina) of hemichordate colonial marine animals of the Paleozoic era with zooids contained in conical cups along a chitinous support
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Origin and Etymology of graptolite
Greek graptos painted (from graphein to write, paint) + English -lite — more at carve
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Britannica.com: Encyclopedia article about graptolite
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