three-lobed
three-mode
three-pad
three-part
three-pass
three-phase
three-phase-brushless
three-pin
three-place
three-point
  three-port
three-position
three-range
three-roll
three-screw
three-shaft
three-shift
three-shifted
three-side
three-spindle
three-spool

    three-port valve

    трёхлинейный распределитель