Art nouveau

style of decorative art popular in the late 19th and early 20th centuries (characterized by plant motifs, flowing lines and asymmetrical shapes)

Art Nouveau (, anglicised ) (French for 'new art') is an international style of art, architecture and design that peaked in popularity at the beginning of the 20th century (1880-1914) and is characterised by highly-stylised, flowing, curvilinear designs often incorporating floral and other plant-inspired motifs.
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Noun
1. a French school of art and architecture popular in the 1890s; characterized by stylized natural forms and sinuous outlines of such objects as leaves and vines and flowers
(hypernym) school

n. Art Nouveau, style of decorative art popular in the late 19th and early 20th centuries (characterized by plant motifs, flowing lines and asymmetrical shapes)

n. Art Nouveau