Where does “heptagonal” come from?
heptagonal (Catalan) comes from Catalan heptàgon, from Latin heptagonus, from Ancient Greek ἑπτάγωνον, from Ancient Greek ἑπτάγωνος, from Ancient Greek ἑπτά, from Proto-Hellenic heptə́, from Proto-Indo-European septḿ̥ — seven.
heptagonal (Catalan): heptagonal
Ancestry of “heptagonal”, step by step