H II region

noun

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

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Meanings

nounH II region (plural H II regions)

plural H II regions · alternative H_(II) region · alternative HII region · alternative H-II region

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

Origin

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

Full word history & related roots →
Cite this entry
APA

H II region. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/H%20II%20region

MLA

“H II region.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/H%20II%20region. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “H II region,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/H%20II%20region.

Source: H II region on Wiktionary, CC BY-SA 4.0.