Firewall Definition

fīrwôl
firewalls
noun
A fireproof wall used as a barrier to prevent the spread of fire.
American Heritage
A software program or hardware device that restricts communication between a private network or computer system and outside networks.
American Heritage

(computer security) The software that monitors traffic in and out of a private network or a personal computer and allows or blocks such traffic depending on its perceived threat.

Wiktionary
verb
To protect (a computer or computer network) by means of a firewall.
American Heritage
(intransitive, motor vehicles or aircraft, slang) To use maximum acceleration.
Wiktionary

Other Word Forms of Firewall

Noun

Singular:
firewall
Plural:
firewalls

Origin of Firewall

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