# H II region

> English word · Noun

## Definitions
1. A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.

## Etymology
From a being region of space having H_(II) emission lines in its spectrum.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/h-ii-region