carbon arc

an electric arc between two carbon electrodes, used mainly for lighting, as in an arc light for a motion-picture projector, or for intense heating, as in the cutting and welding of metals.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carbon arc
1.  a.  an electric arc produced between two carbon electrodes, formerly used as a light source
 b.  (as modifier): carbon-arc light
2.  a.  an electric arc produced between a carbon electrode and material to be welded
 b.  (as modifier): carbon-arc welding

Collins English Dictionary - Complete & Unabridged 10th Edition
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