supercharger

n. apparatus which forces air into the cylinders of an internal-combustion engine to increase its power

For other meanings, see supercharger (disambiguation) A supercharger (blower) is an air compressor that forces more air and more oxygen to the combustion chamber(s) of an internal combustion engine than achievable with ambient atmospheric pressure (natural aspiration). The additional mass of oxygen-containing air that is forced into the engine improves on its volumetric efficiency which allows it to burn more fuel in a given cycle—which in turn makes it produce more power. A supercharger can be powered mechanically by belt, gear and shaft, or chain-drive from the engine's crankshaft. It can also be driven by a gas turbine powered by the exhaust gases from the engine. Turbine-driven centrifugal superchargers are correctly referred to as turbo-superchargers—or more commonly as  turbochargers.
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Noun
1. compressor that forces increased oxygen into the cylinders of an internal-combustion engine
(hypernym) compressor
(part-holonym) internal-combustion engine, ICE
(derivation) supercharge, pressurize, pressurise

supercharger /,sju:pə,tʃɑ:dʤə/
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COMPRESSORE. SOVRALIMENTATORE