collapsar

noun
col·​lap·​sar | \ kə-ˈlap-ˌsär \
plural collapsars

Definition of collapsar

: a massive star that undergoes gravitational collapse especially after colliding with another star Collapsars are massive stars, which in the course of merging with a compact companion undergo core collapse leading to a BH [black hole] … leaving a supernova-like remnant.— P. Mészáros, Science, 5 Jan. 2001 Today most astronomers think gamma-ray bursts result when a massive and rapidly rotating star collapses in on itself to form a black hole. The collapsing star, or collapsar, is a kind of supernova, but the extraordinary heft and spin of the star bring it to a faster and more calamitous end.— Karen Wright, Discover, August 2002 broadly : black hole sense 2 This classification of stars results in three main types: regular stars (covering white dwarfs to super-giants) …, neutron stars and pulsars, … and collapsars (i.e. black holes) … . — Pierre A. Millette, Progress in Physics, January 2014

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of collapsar

1971, in the meaning defined above

History and Etymology for collapsar

collapse entry 1 + -ar (as in quasar)

Learn More About collapsar

Time Traveler for collapsar

Time Traveler

The first known use of collapsar was in 1971

See more words from the same year

Dictionary Entries Near collapsar

colla parte

collapsar

collapse

See More Nearby Entries 

Statistics for collapsar

Cite this Entry

“Collapsar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/collapsar. Accessed 13 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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