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The machinist carefully measured the diameter of the shaft's boss to ensure the gear would fit snugly.
a decorative carving that covers the junction of a vault's or ceiling's ribs.
The architect pointed out the intricate floral boss where the Gothic vault's ribs converged, creating a stunning focal point.
a huge lump of igneous rock projecting through other layers.
"The erosion carved away the softer sedimentary rock, exposing a massive igneous boss."