Definition of myriagon in English:

myriagon

Pronunciation /ˈmɪrɪəɡ(ə)n/ /ˈmɪrɪəɡɒn/

noun

rare
  • A polygon with ten thousand sides.

Origin

Late 17th century; earliest use found in Robert Boyle (1627–1691), natural philosopher. From ancient Greek μυριάς + -gon.