tunnel definition by Webster's New World
- a flue
- a funnel
- a passageway, as through a mountain or under a body of water, as for automotive or rail traffic
- an animal's burrow
- any tunnel-like passage, as one in a mine
Origin: Middle English tonel, a net with wide opening and narrow end ; from Middle French tonnelle, arbor, semicircular vault ; from Old French tonnel, diminutive of tonne, tun
- to dig (a passage) in the form of a tunnel
- to make a tunnel through or under
- to make (one's way) by digging a tunnel
- to make a tunnel
- Physics to pass through a normally impassable barrier or insulator: electrons tunnel through semiconductors
tunnel definition by American Heritage Dictionary
- An underground or underwater passage.
- A passage through or under a barrier.
- Obsolete The main flue on a chimney.
- To make a tunnel through or under.
- To produce, shape, or dig in the form of a tunnel.
Origin: Middle English tonel, tubular net, from Old French tonnelle, diminutive of tonne, tun, possibly of Celtic origin.
- tunˈnel·er, tunˈnel·ler noun
tunnel - Computer Definition
A means of establishing an outbound-connection through a firewall in such a way that it is neither blocked nor monitored. If a cracker has compromised a machine on the other side of a firewall, a tunnel will allow the cracker to communicate with that machine from the Internet. More generally, a tunnel is a path established by one network to send its data via another network’s connections. Tunneling works by encapsulating a network protocol within packets carried by the second network. For example, Microsoft’s PPTP technology allows organizations to send information across a virtual private network (VPN) using the Internet as a transport medium. Tunneling is accomplished by embedding its own network protocol within the TCP/IP packets carried by the Internet.
Graham, R. Hacking Lexicon. [Online, 2001.] Robert Graham Website. http://www.linuxsecurity.com/resource_files/documentation/hacking-dict.html.Webster's New World Hacker Dictionary Copyright © 2010 by Bernadette Schell and Clemens Martin.Published by Wiley Publishing, Inc., Indianapolis, Indiana. Used by arrangement with John Wiley & Sons, Inc.
tunnel - Medical Definition