from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An isolated bright or dark line in a spectrum produced by emission or absorption of light of a single wavelength.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a dark or bright line in an otherwise continuous spectrum caused by the absorption or emission of light, at a single wavelength, by the movement of electrons between energy levels of an atom or molecule


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