Noun
A privy; especially, a privy furnished with a contrivance for introducing a stream of water to cleanse it.
Source: Webster's dictionarywater closet
They are so filthy and bestial that no honest man would admit one into his house for a water-closet doormat. Charles Dickens
It also serves as a divider from a walk-in shower on one side and a water closet on the other. Source: Internet
Rounding out the efficiently arranged 1,442-square-foot property is the aforementioned walled garden, coal bunker now being used as a utility room, and a brick workshop with mezzanine storage and a water closet. Source: Internet