One of the mysteries of the English language finally explained.
Early 18th century; earliest use found in Joseph Moxon (1627–1691), printer and globe maker. From Hellenistic Greek πολυγώνιος polygonal (from ancient Greek πολύγωνον + -ιος, suffix forming adjectives) + -al. With the adjective compare earlier polygon, polygonal, polygonous. With the noun compare earlier polygon.
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