Where does “boter” come from?

boter (Dutch) comes from Middle Dutch bōter, from Old Dutch butera, from Proto-West Germanic buterā, from Latin būtȳrum, from Ancient Greek βούτυρον, from Ancient Greek τυρός, from Proto-Hellenic tūrós, from Proto-Indo-European tuh₂-ró-s — to swell; to crowd; to be strong.

boter (Dutch): Butter, a spread made from churned milk; A butter...