compressor

noun

1. a person or thing that compresses.
2. Anatomy. a muscle that compresses some part of the body.
3. Surgery. an instrument for compressing a part of the body.
4. a pump or other machine for reducing volume and increasing pressure of gases in order to condense the gases, drive pneumatically powered machinery, etc.
5. Electronics. a transducer that produces an output with a range of voltages whose ratio is smaller than that of the range of the input signal.Compare expander(def 2).

noun

1. any reciprocating or rotating device that compresses a gas
2. the part of a gas turbine that compresses the air before it enters the combustion chambers
3. any muscle that causes compression of any part or structure
4. a medical instrument for holding down a part of the body
5. an electronic device for reducing the variation in signal amplitude in a transmission systemCompare expander, compander

n.

1. A muscle that causes compression of a structure upon contraction.