Where does “desetiúhelník” come from?
desetiúhelník (Czech) comes from Czech deset, from Old Czech desět, from Proto-Slavic desętь, from Proto-Balto-Slavic *déśimt, from Proto-Indo-European déḱm̥t — ten.
desetiúhelník (Czech): decagon
Ancestry of “desetiúhelník”, step by step