orifice

An opening, especially to a cavity or passage of the body; a mouth or vent.

An opening; a mouth or aperture, as of a tube, pipe, or other similar object; a perforation; a vent.

See the adjectives.

A mouth or aperture, as of a tube, pipe, etc.; an opening.

A mouth or aperture, as of a tube, pipe, etc.; an opening; as.