The story
- Ancient Greek · derived fromἑπτάγωνον
- English todayheptagon
Since 16th century, from Ancient Greek ἑπτάγωνον (heptágōnon), from ἑπτά (heptá, “seven”) + γωνία (gōnía, “angle”). By surface analysis, hepta- + -gon.
Etymology from Wiktionary, CC BY-SA 4.0.