Usually means: Active galactic nucleus with emission lines.
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We found 6 dictionaries that define the word Seyfert:

General (6 matching dictionaries)
  1. Seyfert: Merriam-Webster
  2. Seyfert: Oxford Learner's Dictionaries
  3. Seyfert: Wordnik
  4. Seyfert: Rhymezone
  5. Seyfert: Stammtisch Beau Fleuve Acronyms
  6. Seyfert: Wiktionary

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Definitions from Wiktionary (Seyfert)

▸ noun:  A surname from German.

Similar:
Seyller, Seybert, Seyler, Seyer, Seifert, Seysses, Seyfried, Seybold, Siefker, Seefeld, more...

Phrases:
seyfert galaxies, Seyfert galaxy, more...

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Similar:
Seyller, Seybert, Seyler, Seyer, Seifert, Seysses, Seyfried, Seybold, Siefker, Seefeld, more...

Phrases:
seyfert galaxies, Seyfert galaxy, more...



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