collapsar

noun

col·lap·sar

kə-ˈlap-ˌsär

plural collapsars

: 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