noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   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

All synonyms

superbubble

Etymology

From super- + shell.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.