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From Medieval Latin Devōnia (“Devon”) + -an. By surface analysis, Devon + -ian. Doublet of Dumnonian.
Etymology from Wiktionary, CC BY-SA 4.0.
Devonian
De·vo·ni·anToday it means: Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 415 to 360 million years ago. Full definition →