We found 9 dictionaries that define the word d-layer:

General (7 matching dictionaries)

1. D-layer: Vocabulary.com
2. d-layer: Wordnik
3. d-layer: Dictionary.com
4. D-layer: Rhymezone
5. d-layer: FreeDictionary.org
6. d-layer: Mnemonic Dictionary
7. D-layer: TheFreeDictionary.com

Computing (1 matching dictionary)

8. D-layer: Encyclopedia

Tech (1 matching dictionary)

9. Glossary of Meteorology (No longer online)

(Note: See d-layers as well.)

Definitions from WordNet (D-layer) ▸ noun:  the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves Opposite: u-layer, f-layer, ionosphere ▸ Words similar to d-layer ▸ Usage examples for d-layer ▸ Idioms related to d-layer ▸ Wikipedia articles (New!) ▸ Popular adjectives describing d-layer ▸ Words that often appear near d-layer ▸ Rhymes of d-layer ▸ Invented words related to d-layer