septagon

From Latin septem (“seven”) + Ancient Greek γωνία (gōnía, “angle”), equivalent to septa- +‎ -gon.

• (US) enPR: sĕpt'əgŏn, IPA^(key): /ˈsɛptəɡɒn/

septagon (plural septagons)

1. (proscribed) A polygon with seven sides and seven angles.

Because septagon is formed by combining Latin septem (“seven”), with Ancient Greek γωνία (gōnía, “angle”), it may be considered less correct than heptagon, which has a fully Greek etymology.

• heptagon

• eptagons, gone past, pontages