| Part of Speech | Definition | |
| Noun | 1. The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves.[Wordnet]. | |
Source: WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | Top | |
Specialty Definition: D-layer
| Domain | Definition | ||
| Aerospace | See ionosphere. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
