Nozzle \Noz"zle\, n. [A dim. of nose. [root]261] [Written also nosle.]

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

2. Specifically:
   (a) A short tube, usually tapering, forming the vent of a hose or pipe.
   (b) 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.

Source: Webster's Revised Unabridged Dictionary (1913)