folding-in
folding-wing
fold-out
foldout
fold-over
foldover
foliage
foliation
folio
folk
  follow
follower
follower-ring
following
follow-on
follow-the-pointer
follow-up
follow-video
fomite
fondant
fondu

    follow valve

    клапан пропорционального управления по управляющему сигналу