Grap″to‐lite (?), n. [NL, Graptolithus, from Gr. � is engraved, written (γράφειν to write) + � stone.] (Paleon.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.