four-cylinder
four-dimensional
Fourdrinier
four-electrode
fourfold
four-groove
four-gun
four-high
Fourier
four-lane
  four-level
four-line
four-lined
four-link
four-lipped
four-lug
four-piece
four-pole
four-quaternary
four-seater
four-spring

    four-level light emitter

    четырехуровневый излучатель света