pneumatic

Pneumatic means "related to air or gas." If you've ever gone to a drive-through bank where you put your deposit in a container that gets shot through a tube into the bank, by a blast of air, then you've used a pneumatic tube.

When you pronounce pneumatic, keep the "p" silent. It comes from a Greek word meaning "air" and "breath." In some cases people call spiritual things pneumatic. In engineering, when something is described as pneumatic, it usually uses air pressure to move things around, like pneumatic tubes or compressors. For instance, when you press the nozzle on a whipped cream can, gas under pressure pushes the cream out quickly, making it fluffy and light.