(engineering) A rotary disk with spiral ribs or grooves, by which several pieces, such as the jaws of a chuck, can be brought together or spread radially.

The plate against which the latch of a door lock strikes as the door is closed. / Part of the centering of an arch, which is driven back to loosen the centering in striking it.

An iron plate in front of the dam of a blast furnace, to strengthen it.

scapula

A swinging plate in a steam engine, bearing two or more wrists, for operating the valves.

A horizontal timber resting on the tiebeams of a roof and receiving the ends of the rafters. It differs from the plate in not resting on the wall.

(anatomy) The hard, exposed portion of a fingernail or toenail, made of translucent keratin protein. / Iron in the form of plates, from which cut nails are made.

A heavy spongy paper, for printing from engraved plates.

An iron plate forming the back of the hearth of a bloomery fire.

A press with a flat carriage and a roller, used for printing from engraved steel or copper plates.