nozzle

noun4

1. •
   A short tube, usually tapering, forming the vent of a hose or pipe.
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. •
   The part of an earbud that accommodates eartips.

   • The shape of the nozzle prevents the use of aftermarket eartips.
4. •
   The nose of an animal; muzzle.

   • At length the acme of a typical Mexican scene was reached when the burros unceremoniously raised their nozzles and brayed loud and long. — 1887