- formally speaking
 - formal relations
 - famine oedema
 - foul mouthed
 - fiegn
 - figurehead
 - fully fledged
 - foetal hypoxia
 - fdi
 - fossa terminalis
 - frontispiece
 - foolishly
 - fatuous
 - fire guard
 - fire up
 - feel ears burning
 - false etymology
 - fermenting
 - fortran control character
 - full house
 - full pelt
 - full tilt
 - full speed
 - flapjack
 - federalists
 - fruit_sugar
 - fructose
 - fructose tolerance test
 - fuchsia
 - food adulteration act
 - flare path
 - fish finger
 - fish stick
 - fingerling
 - fishing line
 - fluttering
 - for fun
 - flapping
 - fit or deserving to be served: (nm) one to whom service is rendered
 - food technology
 - foeniculum
 - food market
 - food and fodder yeast
 - flannels
 - fine powder
 - fitted with a tap
 - fixed line number
 - flanking
 - from day to day
 - fire damage