BATHROOM
bathroom
(noun) a room (as in a residence) containing a bathtub or shower and usually a washbasin and toilet
toilet, lavatory, lav, can, john, privy, bathroom
(noun) a room or building equipped with one or more toilets
Source: WordNet® 3.1
Etymology
Noun
bathroom (plural bathrooms)
A room containing a shower and/or bathtub, and (typically but not necessarily) a toilet.
Synonym: Thesaurus:bathroom
Hyponym: Thesaurus:bathroom
Hypernym: room
(chiefly, US, South Africa, Canada, euphemism) A lavatory: a room containing a toilet and (typically but not necessarily) a bathtub.
Usage notes
From the beginning of the 20th century, bathroom has been the generic word for a room with toilet facilities in American English. As Britons continue to say lavatory relatively more frequently and often loo or WC for a room with a toilet but no bath. Partly from French influence, such rooms are also relatively more common in British homes.[citation needed]
In some contexts, bathroom refers more particularly to the toilet facilities of a private residence, distinguished from public buildings' restrooms, men's rooms, ladies' rooms, etc.
Source: Wiktionary