butter: [OE] The ultimate source of butter is Greek boútūron. This is usually said to be a compound noun, formed from boús ‘cow’ and tūros ‘cheese’, but not all etymologists accept the admittedly attractive hypothesis that butter was once ‘cow-cheese’, preferring to see the Greek word as a foreign borrowing. In Latin it became būtyrum (from which came French beurre), which was borrowed into the West Germanic languages, producing English and German butter and Dutch boter. => cow
