Real Dictionary

magnolia
colour: You can use magnolia to describe things that are creamy-white in colour.
variable noun: A magnolia is a kind of tree with white, pink, yellow, or purple flowers.

magnolia in American English
any of a genus (Magnolia) of trees or shrubs of the magnolia family, with large, fragrant flowers of white, pink, or purple
designating a family (Magnoliaceae, order Magnoliales) of dicotyledonous trees, shrubs, and, sometimes, vines, including the cucumber tree and the tulip tree
noun: any shrub or tree of the genus Magnolia, having large, usually fragrant flowers and an aromatic bark, much cultivated for ornament

magnolia in British English
noun: any tree or shrub of the magnoliaceous genus Magnolia of Asia and North America: cultivated for their white, pink, purple, or yellow showy flowers