noun
quern; hand mill
A traditional hand-operated mill for grinding grain, often consisting of two circular stones.
昔は挽き臼で小麦を粉にした。
In the old days, they ground wheat into flour with a hand mill.
この挽き臼は祖母が使っていたものです。
This quern is something my grandmother used.
Compound of 挽き (hiki, 'grinding', from 挽く) and 臼 (usu, 'mortar, mill').