Meaning: [ef] 
n. 1. a degree on the Fahrenheit scale of temperature 2. a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite 3. the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates 4. the 6th letter of the Roman alphabet.
n. 1. a degree on the Fahrenheit scale of temperature 2. a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite 3. the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates 4. the 6th letter of the Roman alphabet. 
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1. I got an F in chemistry.
2. If you would go up high , then use your own legs ! Do not let yourselves carried aloft; do not seat yourselves on other people's backs and heads .(F. W .
3. Your temperature stands at 100°F.
4. The consonants t, f and s are voiceless.
5. This plant grows well in temperatures above 55°F.
6. Passengers sweltered in temperatures of over 90?F.
7. Daytime temperatures never fell below 80?F.
8. Our seats are in row F of the balcony.
9. Play an F followed by a G.
10. For flash photography, set the aperture at f.5.6.
11. The song is in F.
12. A solitary viola plucks a lonely, soft F sharp.
13. The first word begins with an F.
14. He got F / 'F' in / for Chemistry.
15. Water boils at 212o F.
16. At Cambridge he studied under F.R. Leavis.
17. 'Fox' begins with F / 'F'.
18. 'Fabric' starts with an 'F'/F.
19. He is so crazy about U.F.O.that he laps up all he can read about it.
20. John F. Kennedy,[sentencedict.com] Jr.
21. Her most cherished possession is a 1926 letter from F. Scott Fitzgerald.
22. The Belgian Cup has been won by the favourites F.C. Liege.
23. Water freezes at 32?F.
24. Plane F 103 has homed in on the radio beacon.
25. Lord Beaverbrook, to put it bluntly, played hell with the war policy of the R.A.F.
26. F, move on to floating wheatgerm.
27. Senators F. Sea mammals 7.
28. There you will find mention of F Taylor.
29. That word is spelt with a PH, not an F.
30. The victor in/of the 1960 US Presidential election was John F. Kennedy.