- forty_seventh
- forty_sixth
- ferrite
- flexural infective eczema
- foul_mouthed
- flat bed scanner
- flat bed plotter
- for a bargain price
- for a month of sundays
- forward error analysis
- finger_pointing
- for aught know
- file set
- first_order correlation
- four_wire
- fifty_fifth
- fly_fishing
- friedel and crafts reaction
- focal lesion
- flail_elbow
- forepaw
- frigga
- festive and tragic occasions
- follicular pharyngitis
- fast break
- fortitude
- fastigial nucleus
- far_fetching
- father_in_law's house
- fiji
- four_hundredth
- f_ mode record
- frequency multiplex
- first go
- farmer's lung
- flow away
- frederick the great
- field soybean
- from pillar to post
- forward difference method
- forward scan
- frequency reuse
- foot the bill
- foot valgus
- francisco jose de goya y lucientes
- flavius valerius constantinus
- fire power
- flat arch
- francis edgar stanley
- fish house punch