heptagon

/ˈhɛp.tə.ɡɒn/

HƐP · tə · ɡɒn (3 syllables)

English Noun

Definition

A polygon with seven sides and seven angles.

Etymology

Since 16th century, from Ancient Greek ἑπτάγωνον (heptágōnon), from ἑπτά (heptá, “seven”) + γωνία (gōnía, “angle”). By surface analysis, hepta- + -gon.