D region

proper noun

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

Similar
D layer
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Meanings

proper nounthe D region

alternative D-region

  1. The innermost layer of the ionosphere, located 48 km (30 mi) to 90 km (56 mi) above the surface of the Earth.

    Synonyms: D layer

Synonyms & antonyms

proper nounThe innermost layer of the ionosphere, located 48 km (30 mi) to 90 km (56 mi) above the surface of the Earth.

Similar
D layer
Also see
d layer
Cite this entry
APA

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

MLA

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

Chicago

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

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