noun Etymology: Carl K. Seyfert died 1960 American astronomer Date: 1959 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
SEYFERT GALAXY
Meaning of SEYFERT GALAXY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012