D REGION

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does D region mean? 

• D REGION (noun)
  The noun D REGION has 1 sense:

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

  Familiarity information: D REGION used as a noun is very rare.

 Dictionary entry details 

• D REGION (noun)

Sense 1

Meaning:

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

Classified under:

Nouns denoting spatial position

Synonyms:

D-layer; D region

Instance hypernyms:

part; region (the extended spatial location of something)

Holonyms ("D region" is a part of...):

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

 Context examples 

The genes are found in the HLA-D region in humans and in the I region in mice.

(MHC Class II Gene, NCI Thesaurus)