01 n. One of two circular stones used for grinding grain or other substance in a mill{1}.
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1.
One of two circular stones used for grinding grain or other substance in a mill{1}.“No man shall take the nether or the upper millstone to pledge.” — Deut. xxiv. 6.
Phrases & compounds
Millstone girt —
a hard and coarse, gritty sandstone, dividing the Carboniferous from the Subcarboniferous strata. See Farewell rock, under Farewell, a., and Chart of Geology.
To see into a millstone —
to see into or through a difficult matter.