Definitionen
1.NounAn underground or underwater passage.
2.NounA passage through or under some obstacle.
3.NounA hole in the ground made by an animal, a burrow.
4.NounA wrapper for a protocol that cannot otherwise be used because it is unsupported, blocked, or insecure.
5.NounA 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.
6.NounThe opening of a chimney for the passage of smoke; a flue.
7.NounA 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.
8.NounAnything that resembles a tunnel.
9.VerbTo make a tunnel through or under something; to burrow.
10.VerbTo dig a tunnel.
11.VerbTo transmit something through a tunnel (wrapper for an insecure or unsupported protocol).
12.VerbTo insert a catheter into a vein to allow long-term use.
13.VerbTo undergo the quantum-mechanical phenomenon where a particle penetrates through a barrier that it classically cannot surmount.