Where does “bútur” come from?
bútur (Icelandic) comes from Old English botere, from Latin butyrum, from Ancient Greek βούτυρον, from Ancient Greek τυρός, from Proto-Hellenic tūrós, from Proto-Indo-European tuh₂-ró-s, from Proto-Indo-European tewh₂- — to swell; to crowd; to be strong.
bútur (Icelandic): piece, bit
Ancestry of “bútur”, step by step