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Definition of Graptolite
1. n. One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids.
Definition of Graptolite
1. Noun. Any of a group of extinct aquatic colonial invertebrates, of the class ''Graptolithina'', from the Cambrian and Carboniferous periods ¹
¹ Source: wiktionary.com
Definition of Graptolite
1. [n -S]
Medical Definition of Graptolite
1.