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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Mill·stone n. One of two circular stones used for grinding grain or other substance in a mill1.
    No man shall take the nether or the upper millstone to pledge.   --Deut. xxiv. 6.
 Note:The cellular siliceous rock called buhrstone is usually employed for millstones; also, some kinds of lava, as that Niedermendig, or other firm rock with rough texture. The surface of a millstone has usually a series of radial grooves in which the powdered material collects.
 Millstone girt Geol., 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 or To see through a millstone, to see into or through a difficult matter. (Colloq.)
 

From: Webster's Revised Unabridged Dictionary (1913)

 Fare·well a. Parting; valedictory; final; as, a farewell discourse; his farewell bow.
    Leans in his spear to take his farewell view.   --Tickell.
 Farewell rock Mining, the Millstone grit; -- so called because no coal is found worth working below this stratum. It is used for hearths of furnaces, having power to resist intense heat.