- heptagon (n.)
[heptagon 词源字典]
- 1560s, from Middle French heptagon, from Greek heptagonon, from hepta "seven" (cognate with Latin septem, Gothic sibun, Old English seofon; see seven) + gonia "angle" (see -gon). Related: Heptagonal.[heptagon etymology, heptagon origin, 英语词源]