Bible Dictionaries
Nobili's Rings
Webster's Dictionary
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.
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Bibliography Information
Webster, Noah. Entry for 'Nobili's Rings'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/n/nobilis-rings.html. 1828.