quad(3) (iou) and tunnel(1) (iou)

quad(3) (iou)

quad noun10. N. Amer. colloq. L20.
[Abbreviation.]
= QUADPLEX, QUADROMINIUM.

tunnel noun. LME.
[Old & mod. French tonel (mod. tonneau tun, cask), from tonne TUN noun1: see -EL2. Cf. TONEL.]
A net with a wide opening leading into a narrowing pipelike passage, for catching partridges, ducks, fish, etc. Now rare or obsolete. LME.
a. The shaft or flue of a chimney. LME-E19.
b. gen. A pipe, a tube. M16-L19.
A funnel. obsolete exc. dial. E16.
A man-made underground passage, esp. through a hill or mountain, or under a river or road, usu. for a railway or road to pass through. Also, an underground passage in a mine etc. M18.
Saturday Review A tunnel thirty miles long under the Channel. R. Raymond The vein has been attacked by various tunnels. J. C. Oates Like shouting in a tunnel, and all you hear..is your own voice echoing back. S. Hill The train whistled..running through a tunnel.
transf.
a. An underground passage dug by a burrowing animal. L19.
W. Horwood The moles made their way by tunnel.
b. A natural structure resembling a tunnel, esp. a canal or hollow groove in an organ of the body. L19.
c. Aeronautics etc. = wind tunnel s.v. WIND noun1. E20.
d. Sport. A subway or covered passage by which players enter or leave the field of play. M20.
Running He ran off the track and straight out through the tunnel.
e. A long narrow greenhouse or cloche, usu. made of polythene. M20.
Phrases: light at the end of the tunnel colloq. a long-awaited sign that a period of hardship or adversity is nearing an end. tunnel of love a fairground amusement involving a romantic train- or boat-ride through a darkened tunnel.
Comb.: tunnel-back local a rear extension on a house, containing a scullery etc.; a house built in this style; tunnel diode Electronics a two-terminal semiconductor device, consisting of a heavily doped p-n junction, which has negative resistance at low voltage due to quantum-mechanical tunnelling and is used in high-speed switching; tunnel effect Physics = TUNNELLING (c); tunnel-head (a) the top of a blast-furnace; (b) the limit of the construction of a tunnel; tunnel house = sense 5e above; tunnel-kiln: in which the items being fired are carried on trucks along a continuously-heated passage; tunnel-net = sense 1 above; tunnel-pit, tunnel-shaft a shaft sunk to the level of a tunnel; tunnel-vault = barrel vault s.v. BARREL noun; tunnel vision a condition in which there is a major loss of peripheral vision, or in which anything away from the centre of the field of view escapes attention; fig. inability to see more than a single or limited point of view; tunnel-visioned adjective having tunnel vision.
tunnelist noun (rare) a person who constructs a tunnel; transf. a burrowing animal L18.
tunnel-like adjective resembling (that of) a tunnel M19.

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