active galactic nucleus

noun

A compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion of the (measurable) electromagnetic spectrum.

Similar
AGN
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Meanings

nounactive galactic nucleus (plural active galactic nuclei)

plural active galactic nuclei

  1. astronomyA compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion of the (measurable) electromagnetic spectrum.

    Synonyms: AGN

Synonyms & antonyms

nounA compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion of the (measurable) electromagnetic spectrum.

Similar
AGN
Also see
lacertid

Translations

Chinese Mandarin 活動星系核 /活动星系核
  • 活動星系核 /活动星系核 (huódòng xīngxìhé)region
Finnish aktiivinen galaksiydin
  • aktiivinen galaksiydinregion
German aktiver galaktischer Kern
  • aktiver galaktischer Kernregion
Hungarian aktív galaxismag
  • aktív galaxismagregion
Turkish etkin galaktik çekirdek
  • etkin galaktik çekirdekregion
Cite this entry
APA

active galactic nucleus. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/active%20galactic%20nucleus

MLA

“active galactic nucleus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/active%20galactic%20nucleus. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “active galactic nucleus,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/active%20galactic%20nucleus.

Source: active galactic nucleus on Wiktionary, CC BY-SA 4.0.