D-LAYER

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Synonyms:

D-layer; D region

Classified under:

Nouns denoting spatial position

Instance hypernyms:

part; region (the extended spatial location of something)

Holonyms ("D-layer" is a part of...):

ionosphere (the outer region of the Earth's atmosphere; contains a high concentration of free electrons)

Credits