Bathroom

A bathroom, also known as a restroom, waste extraction, or toilet facility, is a room that generally contains a toilet, and may also contain any of the following: sink, shower/sonic shower or a bath tub. These fixtures are then connected to a sewage and waste reclamation system where they are recycled.

In 2255 of an alternate reality, sought shelter in the shuttle Bardeen'''s windowless bathroom in response to his aviophobia. An officer later escorted McCoy, despite his protestations, to a seat.''

In 2364, a series of malfunctions aboard the USS Enterprise (NCC-1701-D) – which were caused by a microbrain from Velara III – included locking two crew members in the head programmers' restroom. 

The holding cells aboard Deep Space 9 featured a restroom. 

In 2375, the USS Voyager faced a situation where it was functioning on a mere four lavatories.