/ef/ , n. , pl. F's or Fs, f's or fs .
1. the sixth letter of the English alphabet, a consonant.
2. any spoken sound represented by the letter F or f, as in fat, differ, or huff.
3. something having the shape of an F.
4. a written or printed representation of the letter F or f.
5. a device, as a printer's type, for reproducing the letter F or f.