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A boy who opens and shuts a trapdoor in a gallery or level. Raymond.

Rising above the level; protuberant. So high as heaved the tumid hills. Milton.

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…

Not even; not level; not uniform; rough; as, an uneven road or way; uneven ground.

infinite number of solutions. -- Unlimited pump, a kind of deep-well pump placed at the level of the water, and operated from above ground. -- Un*lim"it*ed*ly, adv. -- Un*lim"it*ed*ness, n.

One of the sights of a compass, quadrant, etc. Vane of a leveling staff. (Surv.) Same as Target, 3.

The side of a level or drift.

A battery nearly on a level with the water.

An interior shaft, usually one connecting two levels. Raymond.

A small shaft sunk from one level to another, as for the purpose of ventilation.

One of the forked holders for supporting the telescope of a leveling instrument, or the axis of a theodolite; a wye.

a vertical and a horizontal axis, is provided with a graduated vertical semicircle, and a level for setting it to a given zenith distance, and with a micrometer for measuring the difference of the zenith distances of the two stars.