A flat piece of wood laid in a wall to which woodwork may be securely fastened.

1. A lever that regulates or drives a ratchet wheel.

2. A hinged valve on a pipe organ.

3. A tray or platform used in conjunction with a fork lift for lifting and moving materials.

An instrument consisting of a flat blade with a handle, used in clay work.

One of a pair of plates on the siphon tubes of certain Bivalvia.

One of the disks or pistons in a chain pump.