bathroom UK /ˈbɑːθɹʊm/US /ˈbæθˌɹum/noun 2verb 1forms 3phrases 1 noun2 •a part of a home with a shower or another place to wash the whole body, and often a toiletI wash in the bathroom. — 2016 •(US, Australia) A lavatory: a room containing a toilet and (typically but not necessarily) a bathtub.Most Americans don't know 'WC' and many Brits mock 'bathroom' but almost everyone understands 'toilet' or 'lavatory'. verb1 •To assist a patient with using the toilet and general personal hygiene. formsbathroomed · bathrooming · bathrooms Phrases with bathroom bathroom singerA person with mediocre or amateur singing capabilities.