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a crude tartar, produced as a by-product in casks by the fermentation of wine grapes, used as a mordant in dyeing, in the manufacture of tartaric acid, and in fertilizers.
Historical Examples

After these juices have been secreted, the ores themselves are melted, with argol added to them.
De Re Metallica Georgius Agricola

Everything one eats and drinks has the same taste of argol smoke.
The Unveiling of Lhasa Edmund Candler

It must be borne in mind that this argol was crude tartrates from wine vats, and probably contained a good deal of organic matter.
De Re Metallica Georgius Agricola

The district of argol is first received colonies, who introduced civilisation into Greece.
Ruins of Ancient Cities (Vol. I of II) Charles Bucke

None surely,” interposed argol, “is so vain as to put his prowess on a par with mine.
Patraas R. H. Busk

The solution of argol or tartar is first neutralised with carbonate of potassa, and to every 300 gall.
Cooley’s Practical Receipts, Volume II Arnold Cooley

If Alexandrian senna be used for this preparation, it must be freed from cynanchum (argol) leaves, by picking.
Cooley’s Practical Receipts, Volume II Arnold Cooley

A hole in the apex of the roof lets out the smoke from the argol fire which burns all day in the middle of the tent.
The Siberian Overland Route from Peking to Petersburg, Alexander Michie

argol, let it be understood, is a rather pretty Tartar word for a very ugly thing, which can scarcely be gracefully described.
The International Monthly, Volume 5, No. 3, March, 1852 Various

Or else take equal portions of gold ore, vitriol, argol, and of salt.
De Re Metallica Georgius Agricola

noun
crude potassium hydrogentartrate, deposited as a crust on the sides of wine vats