compressor
 oxford
 views  updated Jun 11 2018com·pres·sor  / kəmˈpresər/ •
n. an instrument or device for compressing something. ∎  a machine used to supply air or other gas at increased pressure, e.g., to power a gas turbine. ∎  an electrical amplifier that reduces the dynamic range of a signal.
 The Oxford Pocket Dictionary of Current English