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fire wall [or] fire·wall

fire wall [or] firewall

 
pronunciation:
faIr wawl
part of speech: noun
definition 1: a wall of fireproof material intended to prevent the spread of fire, as from one part of a building to another.
definition 2: (usu. spelled as one word) software or hardware that prevents unauthorized access to a computer or local area network from an outside network such as the Internet.