three-datum-plane
three-degrees-of-freedom
three-dimensional
three-edged
three-flute
three-fluted
three-gear
three-high
three-jaw
three-jawed
  three-layer
three-level
three-linear
three-lipped
three-lobe
three-lobed
three-mode
three-pad
three-part
three-pass
three-phase

    three-layer hierarchy

    трёхуровневая иерархия