Definition of art nouveau noun from the Oxford Advanced Learner's Dictionary

 

art nouveau

 noun
noun
BrE BrE//ˌɑːt nuːˈvəʊ//
 
; NAmE NAmE//ˌɑːrt nuːˈvoʊ//
 
; BrE BrE//ˌɑː nuːˈvəʊ//
 
; NAmE NAmE//ˌɑːr nuːˈvoʊ//
 
(also Art Nouveau)[uncountable] Architectural styles
 
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a style of decorative art and architecture popular in Europe and the US at the end of the 19th century and beginning of the 20th century that uses complicated designs and curved patterns based on natural shapes like leaves and flowers See related entries: Architectural styles Culture Art nouveau uses long curving lines influenced by the shapes of leaves and flowers. The most famous British artists and designers working in this style were Aubrey Beardsley and Charles Rennie Mackintosh. Word Origin early 20th cent.: from French, literally ‘new art’.
See the Oxford Advanced American Dictionary entry: art nouveau