What is the meaning of d region?

noun

  • The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). d region. Retrieved September 23, 2026, from http://smartdefine.org/d_region/definitions/1268873
ChicagoWordNet. 2010. "d region" http://smartdefine.org/d_region/definitions/1268873 (accessed September 23, 2026).
HarvardWordNet 2010, d region, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/d_region/definitions/1268873>.
MLAWordNet. "d region" 23 October 2010. Web. 23 September 2026. <http://smartdefine.org/d_region/definitions/1268873>