Tunnel meaning

tŭn'əl
An underground or underwater passage.
noun
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To make a tunnel.
verb
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To dig (a passage) in the form of a tunnel.
verb
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To make a tunnel through or under.
verb
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To make a tunnel.
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To pass through a normally impassable barrier or insulator.

Electrons tunnel through semiconductors.

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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.
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noun
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A passage through or under some obstacle.
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A hole in the ground made by an animal, a burrow.
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(computing, networking) A wrapper for a protocol that cannot otherwise be used because it is unsupported, blocked, or insecure.
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A vessel with a broad mouth at one end, a pipe or tube at the other, for conveying liquor, fluids, etc., into casks, bottles, or other vessels; a funnel.
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The opening of a chimney for the passage of smoke; a flue.
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(mining) A level passage driven across the measures, or at right angles to veins which it is desired to reach; distinguished from the drift, or gangway, which is led along the vein when reached by the tunnel.
noun
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To make a tunnel through or under something, to burrow.
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(intransitive) To make a tunnel.
verb
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A passage through or under a barrier such as a mountain.
noun
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A tube-shaped structure.
noun
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To make a tunnel through or under.

Tunneling the granite.

verb
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To produce, shape, or dig in the form of a tunnel.

Tunnel a passageway out of prison.

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An animal's burrow.
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To make (one's way) by digging a tunnel.
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Origin of tunnel

  • Middle English tonel barrel, tubular net from Old French tonnel diminutive of tonne tun possibly of Celtic origin
    From American Heritage Dictionary of the English Language, 5th Edition
  • From Middle French tonnelle.
    From Wiktionary