Learn how to say Graptolite correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word graptolite:
a fossil marine invertebrate animal of the Palaeozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs.
Class Graptolithina, phylum Hemichordata
mid 19th century: from Greek graptos ‘marked with letters’ + -lite: so named because of the impressions left on hard shales, resembling markings with a slate pencil