polygonal

The word 'polygonal' is a direct derivative of 'polygon', which itself originates from the Greek geometric term polygōnon. This Greek compound is built from polys, meaning 'many', and gōnia, meaning 'corner' or 'angle'. The suffix -al, of Latin origin, was later appended to form the adjective, a common pattern in English for creating descriptive terms from nouns. Thus, the literal meaning 'pertaining to a many-angled figure' has been preserved from its ancient Greek roots into modern mathematical and descriptive English usage.

Structure: polygon (many-angled figure) + al (adjective suffix) - polygon: From Greek polygonon, from polys (many) + gōnia (angle). - al: A suffix forming adjectives, from Latin -alis.