D-layer - WordReference.com Dictionary of English

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D-layer

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Concise Oxford English Dictionary © 2008 Oxford University Press:
D-layer/ˈdiːleɪə/

▶noun the lowest layer of the ionosphere, able to reflect low-frequency radio waves.

– origin 1930s: from an arbitrary use of the letter D.

'D-layer' also found in these Oxford entries:

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