noun. an tool which documents the motions or volume alter of the lungs. The documentation is generated either by electric monitoring of the rate and level of respiratory motions or by X-ray imaging of the lungs once they have been injected with a gas to better the visual contrast between different regions of tissue. Commonly referred to as pneumatograph- stethograph.
PNEUMOGRAPH: "The pneumograph will allow us to get a better view of what is going on and how to treat your symptoms."