F-

Mil.

(in designations of aircraft) fighter: F-105.

* * *

f (no period),

an abbreviation for the following:

1. farad.

2. femto-.

3. focal length (used especially in F numbers to express the effective diameters of lenses in terms of their focal lengths).

4. Music. forte (loud).

5. frequency.

f.,

an abbreviation for the following:

1. fathom.

2. female.

3. feminine.

4. (of lead pencils or pens) fine.

5. florin.

6. fluid (ounce).

7. folio.

8. following.

9. franc or francs.

F (no period),

fluorine (chemical element).

F (no period),

an abbreviation for the following:

1. Fahrenheit: »

32 °F = 32 degrees on the Fahrenheit scale.

2. Genetics. a filial generation (used with a subscript number, as F₁ or the first generation of offspring of a mating, F₁ or second, and so on).

3. (of lead pencils or pens) fine.

4. Photography. focal length.

5. franc or francs.

6. Physics. free energy.

7. French: »

OF = Old French.

8. Friday.

9. Mathematics. function.

F.,

an abbreviation for the following:

1. Fahrenheit.

2. February.

3. Fellow (of), as in F.R.S. = Fellow of the Royal Society: »

Sir Isaac Newton, F.R.S.

4. fluid (ounce).

5. folio.

6. France.

7. French.

F-,

fighter (in the U.S. Air Force): »

the swing-wing F-111.