heptagon/ˈhɛp.tə.ɡɒn/EtymologySince 16th century, from Ancient Greek ἑπτάγωνον (heptágōnon), from ἑπτά (heptá, “seven”) + γωνία (gōnía, “angle”). By surface analysis, hepta- + -gon.heptagon means A polygon with seven sides and seven angles. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA polygon with seven sides and seven angles.