noun

• A device that produces pressure, such as a gas compressor that produces pressurized gas.
• A device that squeezes (compresses).
• An instrument for compressing an artery (especially the femoral artery) or other part.
• An apparatus for confining or flattening between glass plates an object to be examined with the microscope; a compressorium.
• A machine for compressing gases, especially an air compressor.
• (audio, sound engineering) A device that reduces the dynamic range of an audio signal.
• (anatomy) A muscle that compresses certain parts.
• (computing) A program or algorithm for compressing data.