'D-layer' definitions:
Definition of 'D-layer'
From: WordNet
noun
The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves [syn: D-layer, D region]
Definition of 'D-layer'
From: GCIDE
- D-layer \D-layer\ n. the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves.
- Syn: D region. [WordNet 1.5]