Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: firewall  fI(-u)r-wol
  1. (colloquial) the application of maximum thrust
    "he moved the throttle to the firewall"
  2. (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
  3. A fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle

Derived forms: firewalls

Type of: drive, driving force, security system, thrust, wall

Encyclopedia: Firewall