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Adjacent Words

F atra
F Canadensis
F canaliculata
f Canossa
F carica
F catenatus
F clef
F coccinea
F corniculata
F Cretica
F distribution
F elastica
F elatior
F ferruginea
F Islandicus
F longipes
F marila
F marmorata
F Meleagris
f number
F officinalis
F pardina
F region
F religiosa
F rotundifolia
F rufa
F sambucifolia
F vesca
F vesiculosus
F vulgare

F layer definitions

WordNet (r) 3.0 (2005)

1: 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 [syn: Appleton layer, F layer, F region]

Merriam Webster's

noun Date: 1928 the highest and most densely ionized regular layer of the ionosphere occurring at night within the F region


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