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f layer is a noun 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". It carries one recorded sense.
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
Definitions, synonyms and semantic relations for f layer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.