Noun

1. A device for delivering pressurized air in a controlled quantity to a controlled location. At its most simple terms a bellows is a container which is deformable in such a way as to alter its volume which has an outlet or outlets where one wishes to blow air.
2. Any flexible container or enclosure, as one used to cover a moving joint.
4. The lungs.
5. Flexible, light-tight enclosures connecting the lensboard and the camera back.