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arc spectrum

American  

noun

Physics.

  1. a spectrum formed from the light produced by an electric arc, characteristic of the gas or vapor through which the arc passes.

Example Sentences

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The substances under the head of 'Not in the Solar Spectrum' are often placed there because the elements have few strong lines or none at all in the limit of the solar spectrum when the arc spectrum, which I have used, is employed.

From Project Gutenberg

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.