[L. umbra, shade.] A shade or screen used as a protection from the rays of the sun or from rain. It is formed of strips of whalebone or steel fastened to a stick or hollow iron rod and covered with silk, cotton, or alpaca. Umbrella silk is made chiefly in Lyons and Crefeld. - The umbrella tree is an American magnolia with white flowers and rose-colored fruit, the leaves being crowded on the top of the flowering branch in an umbrella-like circle.