1. The sixth letter of the English alphabet, is a labial articulation, formed by placing the upper teeth on the under lip, and accompanied with an emission of breath. F, in English, has one uniform sound, as in father after. Its kindred letter is v, which is chiefly distinguished from f by being more vocal or accompanied with more sound. As a numeral F stands for 40, and with a stroke placed over it 40,000. It often stands for fellow, as in F.R.S. F or Fa. in music, is the fourth note rising in this order in the gamut, ut, re, mi, fa.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• af,
• sf,
• gf,
• fi,
• fc,
• wf,
• fp,
• bf,
• if,
• fx,
• jf,
• fu,
• fd,
• fg,
• tf,
• fs,
• nf,
• of,
• fo,
• ff

• fa,
• FYE,
• foe,
• fha,
• FOO,
• Fu,
• K,
• G,
• f.,
• -y,
• Of,
• L,
• Foy,
• Fo,
• e-,
• fl,
• fe,
• H,
• ft.,
• J,
• few,
• Fay,
• FAW,
• fey,
• e,
• f's,
• fee,
• If,
• i,
• FAA,
• D,
• A,
• W,
• y,
• FAE,
• a-,
• B,
• fao,
• C.

The adjective form of the word "F" is "effusive".