F LAYER

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

The highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission

Synonyms:

Appleton layer; F layer; F region

Classified under:

Nouns denoting spatial position

Instance hypernyms:

part; region (the extended spatial location of something)

Holonyms ("F layer" is a part of...):

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

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