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
Origin of graptolite
Greek graptos painted (from graphein to write, paint) + English -lite — more at carve
First Known Use: 1841
Learn More about graptolite
Britannica.com: Encyclopedia article about "graptolite"
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