Septagon vs. Heptagon

Septagon

In geometry, a heptagon is a seven-sided polygon or 7-gon.

The heptagon is sometimes incorrectly referred to as the septagon, using “sept-” (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix) together with the Greek suffix “-agon” meaning angle.

Heptagon

In geometry, a heptagon is a seven-sided polygon or 7-gon.

The heptagon is also occasionally referred to as the septagon, using “sept-” (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix) together with the Greek suffix “-agon” meaning angle.

Heptagon (noun)

a plane figure with seven straight sides and angles.