'Nobili's rings' definitions:

Definition of 'Nobili's rings'

From: GCIDE

Nobili's rings \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.]