D-region

A form of D region — The innermost layer of the ionosphere, located 48 km (30 mi) to 90 km (56 mi) above the surface of the Earth.

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Meanings

proper nounthe D-region
  1. alternativeAlternative form of D region.
Cite this entry
APA

D-region. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/D-region

MLA

“D-region.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/D-region. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “D-region,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/D-region.

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