tunnel

IPA: tˈʌnʌɫ

An underground or underwater passage.
A passage through or under some obstacle.
A hole in the ground made by an animal, a burrow.
(computing, networking) A wrapper for a protocol that cannot otherwise be used because it is unsupported, blocked, or insecure.
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.
The opening of a chimney for the passage of smoke; a flue.
(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.
(figurative) Anything that resembles a tunnel.

(transitive) To make a tunnel through or under something; to burrow.
(intransitive) To dig a tunnel.
(computing, networking) To transmit something through a tunnel (wrapper for insecure or unsupported protocol).
(transitive, medicine) To insert a catheter into a vein to allow long-term use.
(physics) To undergo the quantum-mechanical phenomenon where a particle penetrates through a barrier that it classically cannot surmount.

Examples of "tunnel" in Sentences

"This tunnel is the future," he told The Associated Press.
The area being drilled for the tunnel is about 10 times that of Brightwater.
As Dan Bertolet said before me, the tunnel is a done deal just like the Monorail was.
Appalled, I absolutely agree with you that a tunnel is an exponential improvement over an elevated waterfront highway.
The train tunnel, which will be the longest such tunnel, is expected to open by the end of 2017 when construction is completed.
Exploring the mine's main tunnel is a must for all visitors and it's an interesting experience during the day, to be sure — but at midnight ... well, that's another thing.
The light at the end of the tunnel is a freight train but given the fact that the U.S. spends more money on “defense” than the rest of the planet combined, the legions have to do something.
When the twin tunnel is opened for traffic, probably in late 2017, it should cut the travel time between Zurich and Milan to 2 1/2 hours from 3 1/2 hours, and will provide the key north-south axis link between the ports of Rotterdam and Genoa.