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)

Keep scrolling for more

Learn More about collapsar

Statistics for collapsar

Look-up Popularity

Time Traveler for collapsar

The first known use of collapsar was in 1971

See more words from the same year

Comments on collapsar

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

WORD OF THE DAY

playful or foolish behavior

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

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

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!