cir·​cum·​stel·​lar | \ ˌsər-kəm-ˈste-lər How to pronounce circumstellar (audio) \

Definition of circumstellar

: surrounding or occurring in the vicinity of a star circumstellar dust

Examples of circumstellar in a Sentence

Recent Examples on the Web

The newborn star lit up with nuclear fusion, sending light and heat out into the spinning circumstellar disk. Sarah Kaplan,, "Many asteroids might be remnants of 5 destroyed worlds, scientists say," 3 July 2018 Nesvorny and many others now think that gravity kicks in once clumps in the circumstellar disk reach the pebble stage, swiftly pulling together massive amounts of material to form a huge new planet. Sarah Kaplan,, "Many asteroids might be remnants of 5 destroyed worlds, scientists say," 3 July 2018 As with the circumstellar disk hypothesis, the lack of infrared emission is a problem. Kimberly Cartier, Scientific American, "Have Aliens Built Huge Structures around Boyajian’s Star?," 1 May 2017 Based upon the new data, circumstellar dust—dust that orbits a star—is now the best explanation for Tabby's Star. Eric Berger, Ars Technica, "Dimming of Tabby’s Star likely caused by something less sexy than aliens," 4 Oct. 2017 Dust near a star, known as circumstellar dust, hits the Goldilocks test for what could be causing continued dimming. David Grossman, Popular Mechanics, "Scientists Have a New Theory to Explain 'Alien Megastructure' Star," 4 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'circumstellar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of circumstellar

1951, in the meaning defined above

Keep scrolling for more

Learn More about circumstellar

Statistics for circumstellar

Look-up Popularity

Time Traveler for circumstellar

The first known use of circumstellar was in 1951

See more words from the same year

More from Merriam-Webster on circumstellar

Rhyming Dictionary: Words that rhyme with circumstellar

Comments on circumstellar

What made you want to look up circumstellar? Please tell us where you read or heard it (including the quote, if possible).


friendly or mild

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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