| Noun | 1. | firewall - the application of maximum thrust; "he slammed the throttle to the firewall" |
| 2. | firewall - (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. | firewall - fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle |
| 1. | firewall - firewall code. | ||
| 2. | firewall - firewall machine. |