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F.A.
F.A.M.
f.a.s.
f.b.y.
f.c.l.
F clef
F distribution
f.i.w.
F layer
f-number
F/O.
f.o.b.
F.R.G.
F.R.S.
F region
f-stop
f-word
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F layer
F lay·er


noun 
Definition:
 
1. meteorology 
Same as  F region
2. area between Earth's cores: the transition zone between the solid inner core of Earth and its more fluid outer layer, at a depth of approximately 5,100 km (3,200 mi)
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