Bathroom
Overview
A bathroom is a room for bathing
Bathing
Bathing is the washing or cleansing of the body in a fluid, usually water or an aqueous solution. It may be practised for personal hygiene, religious ritual or therapeutic purposes or as a recreational activity....

 in containing a bathtub
Bathtub
A bath , bathtub , or tub is a large container for holding water in which a person may bathe . Most modern bathtubs are made of acrylic or fiberglass, but alternatives are available in enamel over steel or cast iron, and occasionally waterproof finished wood...

 and/or a shower
Shower
A shower is an area in which one bathes underneath a spray of water.- History :...

 and optionally a toilet
Toilet
A toilet is a sanitation fixture used primarily for the disposal of human excrement, often found in a small room referred to as a toilet/bathroom/lavatory...

, a sink/hand basin/wash basin
Sink
A sink is a bowl-shaped plumbing fixture used for washing hands, for dishwashing or other purposes. Sinks generally have taps that supply hot and cold water and may include a spray feature to be used for faster rinsing...

 and possibly also a bidet
Bidet
A bidet is a low-mounted plumbing fixture or type of sink intended for washing the genitalia, inner buttocks, and anus. It was originally a French word.-History:...

.

In North American English
North American English
North American English is the variety of the English language of North America, including that of the United States and Canada. Because of their shared histories and the similarities between the pronunciation, vocabulary and accent of American English and Canadian English, the two spoken languages...

 a "bathroom" is commonly used as a euphemism
Euphemism
A euphemism is the substitution of a mild, inoffensive, relatively uncontroversial phrase for another more frank expression that might offend or otherwise suggest something unpleasant to the audience...

 for a room containing a toilet
Toilet (room)
A modern toilet is a room within a private dwelling, office of other building containing a toilet and often also a sink...

 or possibly a public toilet (which, in the USA, is more commonly called a "restroom").
Although it was not with hygiene in mind, the first records for the use of baths date back as far as 3000 B.C.
 
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