A movable mechanical support, usually in a television or motion picture studio, to suspend a microphone within range of the performers but above the field of view of the camera.

1. A row of joined floating timbers that extend across a river or enclose an area of water for the purpose of keeping saw logs together.

2. A temporary floating barrier launched on a body of water to contain material, for example, an oil spill.

3. A structure consisting of joined floating logs placed in a stream to retard the flow.

A movable steel arm installed on certain types of cranes or derricks to support hoisting lines that must carry loads.

1. A spar attached to a mast or kingpost of a ship carrying cargo-hoisting gear.

2. A spar upon which the lower side of a sail is bent.