Suppressor (noun)

A person or thing that suppresses or restrains something, such as a person or device that quells noise or inhibits a gene.

Origin:

From the verb "suppress" + the noun "-or" (one that performs a particular action).

Examples:

1. The muffler on the car is a suppressor that reduces the noise of the engine.
2. The suppressor on the gun helps to muffle the sound of the shot.
3. The government used suppressors to silence the dissent of political opposition.
4. The researcher discovered a suppressor gene that was inhibiting the expression of a specific trait.
5. The suppressor in the circuit prevented the electrical current from causing a short circuit.