f's

noun pl. f's, F's

1. the sixth letter of the English alphabet: a modification of the Old Greek digamma (), ultimately from the Phoenician
2. any of the speech sounds that this letter represents, as, in English, the (f) of fire
3. a type or impression for f or F
4. the sixth in a sequence or group
5. an object shaped like

adjective

1. of f or F
2. sixth in a sequence or group
3. shaped like