köken: Etymology tree Proto-Indo-European *(s)ker-der. Ancient Greek κίρκος (kírkos)der. Ancient Greek κίρκινος (kírkinos)der. Latin circinusbor. ▲ Latin circulusinflu.? Old High German -ilinflu.? Old High German zirkil Middle High German zirkel German Zirkelbor. Russian циркуль Borrowed from German Zirkel, from Latin circulus.