Sey·fert galaxy
| \ ˈsē-fərt-
also ˈsī- \
also ˈsī- \
Definition of Seyfert galaxy
: any of a class of spiral galaxies that have small compact bright nuclei characterized by variability in light intensity, emission of radio waves, and spectra
— called also Seyfert
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“Seyfert galaxy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Seyfert%20galaxy. Accessed 19 Jun. 2021.
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The first known use of Seyfert galaxy was in 1959
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