[1805–15; mill1 + stream]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: alpaca, backlash, makeup, platinum, polarization
Examples of 'millstream' in a sentence
millstream
Cross millstream; follow path for ½ mile to cross road (132386).
Times, Sunday Times (2018)
It's actually a millstream, an artificial watercourse technically known as a leat.