Usually means: Characteristic frequency of atomic emission.
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We found 15 dictionaries that define the word spectral line:

General (7 matching dictionaries)
  1. spectral line: Merriam-Webster
  2. spectral line: American Heritage Dictionary of the English Language
  3. spectral line: Wiktionary
  4. spectral line: Infoplease Dictionary
  5. spectral line: Dictionary.com
  6. Spectral line: Wikipedia, the Free Encyclopedia
  7. spectral line: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. spectral line: Encyclopedia

Medicine (1 matching dictionary)
  1. spectral line: Merriam-Webster Medical Dictionary

Science (4 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Chemistry Dictionary (No longer online)
  3. Imagine the Universe! Dictionary (No longer online)
  4. SPECTRAL LINE: Zoom Astronomy Glossary

Tech (2 matching dictionaries)
  1. High-Energy Astrophysics (No longer online)
  2. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (spectral line)

noun:  (physics) 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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