supershell
nounEtymology From super- + shell.
1
Astronomy, Natural sciences A large region carved out of the interstellar medium by the combination of several supernova shells, leading to a lower density of gas and plasma within than without, larger than any single supernova could create.
- Synonyms
- superbubble
- Coordinate terms
- heliosphere, astrosphere, circumgalactic medium, intergalactic cloud, intergalactic medium, interplanetary medium, interstellar cloud, interstellar medium, intracluster medium, nebula