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A ring of metal, leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc.

A pot containing melted tin into which the plates are dipped to be coated.

One of the holes in floor or other plates to permit water to flow through.

A plate heated by hot water contained in a double bottom or jacket. Knight.

A thin metal sheet, plate, or strip, as of lead. And Christians slain roll up in webs of lead. Fairfax. Specifically: -

A long notch with a horizontal edge, as in the top of a vertical plate or plank, through which water flows, -- used in measuring the quantity of flowing water.

In steam boilers and sheet-iron work, a strip riveted upon the edges of plates that form a butt joint.

A plate the film of which retains its sensitiveness only while wet. The film used in such plates is of collodion impregnated with bromides and iodides. Before exposure the plate is immersed in a solution of silver nitrate, and immediately after exposure it is developed and fixed.

n of the eyelids, often those of one eye only. Wink at the footman to leave him without a plate. Swift.

ed to an even thread by being passed between grooved rollers, or drawn through holes in a plate of steel.

To form (a piece of metal) into wire, by drawing it through a hole in a plate of steel.

f pattern in gelatin, which has been hardened after certain operations, is pressed upon a plate of lead or other soft metal. An intaglio impression in thus produced, from which pictures may be directly printed, but by a slower process than in common printing.

The thread of a screw. The threads of screws, when bigger than can be made in screw plates, are called worms. Moxon.

overed or described by Olanus Wormius, a Danish anatomist. Wormian bones, small irregular plates of bone often interposed in the sutures between the large cranial bones.

alm down, the hand drops. It is chiefly due to plumbism. Called also hand drop. -- Wrist plate (Steam Engine), a swinging plate bearing two or more wrists, for operating the valves.

The posterior, or fourth, lateral plate in the plastron of turtles; -- called also xiphisternum.

A zinc plate prepared for printing by zincography; also, a print from such a plate.

Pertaining to, or resembling, zinc; -- said of the electricity of the zincous plate in connection with a copper plate in a voltaic circle; also, designating the positive pole. [Obs.]