Airlock

From Memory Alpha, the free Star Trek reference.

An airlock is the point of entry to a space station or starship which allows ingress and egress to empty space or another vessel which has docked at the portal.

Typically airlocks are located on the port or starboard sides of starships rather than in a ventral or dorsal position which are usually reserved for the presence of cargo bays or shuttlebays.

The airlocks on Deep Space 9 had built-in weapon detectors capable of detecting military technology carried by persons boarding the station from docked starships.

A frequent threat in space travel was to be "thrown out" of an airlock into the vacuum of space.

In 2153 Jonathan Archer tortured an Osaarian for information regarding the Xindi superweapon by placing him in an airlock and threatening to open it. (ENT: "Anomaly")

Krax and Rom attempted to kill Quark in 2369 by decompressing an airlock. (DS9: "The Nagus")

Elim Garak attempted to open an airlock on Deep Space 9 following an attack of claustrophobia in early 2375. (DS9: "Afterimage")