No"bi*li's rings(?). [After Leopoldo Nobili, an Italian physicist who first described them in 1826.] (Physics) Colored rings formed upon a metal plate by the electrolytic disposition of copper, lead peroxide, etc. They may be produced by touching with a pointed zinc rod a silver plate on which is a solution of copper sulphate.
[Webster 1913 Suppl.]
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Tue 11th December 2018