radio galaxy

noun

: a galaxy that is a powerful source of radio waves

Examples of radio galaxy in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The result is an external pressure far greater than is typically experienced by galaxies of this type, known as radio galaxies due to their brightness in the radio region of the electromagnetic spectrum. Robert Lea, Space.com, 19 Jan. 2026 The surrounding plumes of incredibly hot gas exert their own pressure, in this case even higher than most other radio galaxies. Andrew Paul, Popular Science, 15 Jan. 2026 It was previously classified as a radio galaxy, but the new research released in March has revealed otherwise. Julia Musto, Fox News, 1 Apr. 2023

Word History

First Known Use

1959, in the meaning defined above

Time Traveler
The first known use of radio galaxy was in 1959

Cite this Entry

“Radio galaxy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radio%20galaxy. Accessed 1 Feb. 2026.

More from Merriam-Webster on radio galaxy

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!