The Collaborative International Dictionary
Polishing snake
Polishing \Pol"ish*ing\, a. & n. from Polish. Polishing iron, an iron burnisher; esp., a small smoothing iron used in laundries. Polishing slate.
A gray or yellow slate, found in Bohemia and Auvergne, and used for polishing glass, marble, and metals.
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A kind of hone or whetstone; hone slate.
Polishing snake, a tool used in cleaning lithographic stones.
Polishing wheel, a wheel or disk coated with, or composed of, abrading material, for polishing a surface.
Wiktionary
polishing snake
n. A tool used in cleaning lithographic stones.