Webster's Revised Unabridged Dictionary · 1913

D-layer

D-layer , noun

the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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