Stressing the use of curved lines as opposed to rectilinear which stresses straight lines. Source: Kimberley Reynolds and Richard Seddon, "Illustrated Dictionary of Art Terms"<br><br>Formed or characterized by curving lines. Elements of late Gothic and Art Nouveau ornament are examples of curvilinear treatment of form. Also curvilineal.Examples:Designed by Hector Guimard (French, 1867-1942), Panel, c. 1900, early 20th century, silk and paint on silk, width 18 inches (45.7 cm), length 27 inches (68.6 cm), Metropolitan Museum of Art, NY. See Art Nouveau. .