F layer

[ ef-ley-er ]

/ ˈɛf ˌleɪ ər /

noun Physics.

the highest of the radio-reflective layers of the ionosphere, beginning at an altitude of about 80 miles (130 km) and consisting of two parts, the lower part (F1 layer ) being detectable in the daytime only, the higher (F2 layer, or Appleton layer ) being constant and constituting the ionospheric layer most favorable for long-range radio communication.

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LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.

Question 1 of 13

How do you say “cat” 🐈 in Spanish?

gato/gata

cato/cata

gatto/gatta

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Origin of F layer

First recorded in 1925–30

Example sentences from the Web for F layer

"By John the Flayer's pony," said Pete; and he laughed and made light of his night-long walk.
The Manxman|Hall Caine
He could imagine the thousands watching grimly while the flayer used his knife.
King--of the Khyber Rifles|Talbot Mundy
He is a treacherous dog and may the flayer get all such treacherous dogs!
The Life of Ludwig van Beethoven, Volume I (of 3)|Alexander Wheelock Thayer