Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An underground or underwater passage.
  • n. A passage through or under a barrier.
  • n. Obsolete The main flue on a chimney.
  • transitive v. To make a tunnel through or under.
  • transitive v. To produce, shape, or dig in the form of a tunnel.
  • intransitive v. To make a tunnel.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An underground or underwater passage.
  • n. A passage through or under some obstacle.
  • n. A hole in the ground made by an animal, a burrow.
  • v. To make a tunnel through or under something, to burrow.
  • v. To make a tunnel.

from the GNU version of the Collaborative International Dictionary of English

  • n. A vessel with a broad mouth at one end, and a pipe or tube at the other, for conveying liquor, fluids, etc., into casks, bottles, or other vessels; a funnel.
  • n. The opening of a chimney for the passage of smoke; a flue; a funnel.
  • n. An artificial passage or archway for conducting canals, roads, or railroads under elevated ground, for the formation of roads under rivers or canals, and the construction of sewers, drains, and the like.
  • n. 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.
  • transitive v. To form into a tunnel, or funnel, or to form like a tunnel.
  • transitive v. To catch in a tunnel net.
  • transitive v. To make an opening, or a passageway, through or under
  • intransitive v. To make a tunnel.

from The Century Dictionary and Cyclopedia

  • n. The opening of a chimney for the passage of smoke; a flue.
  • n. Hence, figuratively, a nostril.
  • n. A funnel. See funnel, 1.
  • n. A long pipe-like passage made of wire, into which partridges were decoyed.
  • n. A tunnel-net.
  • n. An arched drain.
  • n. A gallery, passage, or roadway beneath the ground, under the bed of a stream, or through a hill or mountain.
  • n. In mining, any level or drift in a mine open at one end, or which may serve for an adit. See adit, 1.
  • n. In zoology, the underground burrow of some animals, when long and tortuous, as of the mole or of the gopher.
  • To form, cut, ordig a tunnel through or under.
  • To form like a tunnel; hollow out in length.
  • To catch in a tunnel-net.
  • To form, cut. or drive a tunnel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a passageway through or under something, usually underground (especially one for trains or cars)
  • v. move through by or as by digging
  • v. force a way through
  • n. a hole made by an animal, usually for shelter

Etymologies

Middle English tonel, tubular net, from Old French tonnelle, diminutive of tonne, tun, possibly of Celtic origin.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle French tonnelle. (Wiktionary)

Examples

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