f : Idioms & Phrases
F clef
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noun a clef that puts the F below middle C on the fourth line of a staff
bass clef.
WordNet
- the bass clef. See under
Clef .
Webster 1913
f layer
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noun 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
F layer; Appleton layer.
WordNet
f number
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noun the ratio of the focal length to the diameter of a (camera) lens system
focal ratio; stop number; speed.
WordNet
f region
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noun 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
F layer; Appleton layer.
WordNet
penicillin f
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noun the first form of penicillin that was isolated in Great Britain
