firewall

Noun

• a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle

• (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet

• (colloquial) the application of maximum thrust
  • he moved the throttle to the firewall