nozzle

Short definition from Wiktionary

Noun

1. 1
   A short tube, usually tapering, forming the vent of a hose or pipe.
2. 2
   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.
3. 3
   The nose of an animal; muzzle.
4. 4
   The part of an earbud that accommodates eartips.