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f.b.
f.b.y.
f.c.l.
F clef
f/d
F distribution
f.i.o.
f.i.w.
F layer
F. Lt
F/Lt
f-number
f.o.b.
f.o.r.
f.r.
F region
f-stop
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F layer

F layer


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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