a room or building equipped with one or more toilets | plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe |
a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | a covered cistern; waste water and sewage flow into it |
a toilet that is cleaned of waste by the flow of water through it | a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof |
| (technology) a process that acts to absorb or remove energy or a substance from a system |