Defn: 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. Tunnel head (Metal.), the top of a smelting furnace where the materials are put in. — Tunnel kiln, a limekiln in which coal is burned, as distinguished from a flame kiln, in which wood or peat is used. — Tunnel net, a net with a wide mouth at one end and narrow at the other. — Tunnel pit, Tunnel shaft, a pit or shaft sunk from the top of the ground to the level of a tunnel, for drawing up the earth and stones, for ventilation, lighting, and the like.
TUNNEL
Tun"nel, v. t. [imp. & p. p. Tunneled ( or Tunnelled; p. pr. & vb. n.
Tunneling or Tunnelling.]
1. To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests. Derham.
2 2
Defn: To catch in a tunnel net.
3. To make an opening, or a passageway, through or under; as, to tunnel a mountain; to tunnel a river.
TUNNEL STERN
Tun"nel stern.
Defn: A design of motor-boat stern, for use in shallow waters, in which the propeller is housed in a tunnel and does not extend below the greatest draft.
TUNNY
Tun"ny, n.; pl. Tunnies. Etym: [L. thunnus, thynnus, Gr. tonno, F. &
Pr. thon.] (Zoöl.)
Defn: Any one of several species of large oceanic fishes belonging to the Mackerel family, especially the common or great tunny (Orcynus or Albacora thynnus) native of the Mediterranean Sea and the Atlantic Ocean. It sometimes weighs a thousand pounds or more, and is extensively caught in the Mediterranean. On the American coast it is called horse mackerel. See Illust. of Horse mackerel, under Horse. [Written also thynny.]