Nozzle

Part of speech: noun (n.)

1. The nose; the snout; hence, the projecting vent of anything; as, the nozzle of a bellows.

2. Specifically:

3. A short tube, usually tapering, forming the vent of a hose or pipe.

4. A short outlet, or inlet, pipe projecting from the end or side of a hollow vessel, as a steam-engine cylinder or a steam boiler.