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From: Webster's Revised Unabridged Dictionary (1913)

 Ley·den jar Ley·den phi·al n. Elec. A glass jar or bottle used to accumulate electricity.  It is coated with tin foil, within and without, nearly to its top, and is surmounted by a brass knob which communicates with the inner coating, for the purpose of charging it with electricity. It is so named from having been invented in Leyden, Holland.