Wikipedia
Quern-stone
Quern-stones are stone tools for hand- grinding a wide variety of materials. They are used in pairs. The lower, stationary, stone is called a quern, while the upper mobile stone is called a handstone. They were first used in the Neolithic to grind cereals into flour.
Usage examples of "quern-stone".
We kept a course parallel to the river, the hack swaying from side to side as the wooden-toothed Jehu on the box-seat picked our way recklessly round an obstacle course of desquamated roof-tiles, shattered bits of quern-stone and the iron hoops and broken staves of long-emptied kegs of ale.