mercury arc

noun Electricity.
a bluish-green electric arc that has passed through a mercury-vapor cathode.

1915–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mercury arc
a.  an electric discharge through ionized mercury vapour, producing a brilliant bluish-green light containing ultraviolet radiation
 b.  See also ignitron (as modifier): a mercury-arc rectifier

Collins English Dictionary - Complete & Unabridged 10th Edition
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