TUNNEL 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. Tunnel head (Metal.), the top of a smelting furnace where the materials are put in. -- Tunnel kiln, a limekiln in wh…
VASCULAR a.
f an arrangement of, vessels; as, the vascular system in animals, including the arteries, veins, capillaries, lacteals, etc.