Definition of polygonial in US English:

polygonial

adjective

  • Polygonal.

Origin

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.

Pronunciation

polygonial

/ˌpɒlɪˈɡəʊnɪəl/