Definitions for d region
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Random House Webster's College Dictionary
D region(n.)
Category: Physics
Ref: D layer.
Origin of D region:
1925–30
Princeton's WordNet
D-layer, D region(noun)
the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
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"d region." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/d region>.

