also: みずうす
noun
water-powered millstone
Archaic term for a millstone driven by water power. Found in historical documents; not used in modern Japanese.
碾磑は、昔の水車小屋で穀物を挽くのに使われた。
The water-powered millstone was used to grind grain in old watermills.
Compound of 碾 (grind with a roller) and 磑 (millstone). The reading てんがい is Sino-Japanese. The alternate form 水碓 combines 水 (water) and 碓 (pestle/mill) with the native reading みずうす.