a collapsible circular shade for protection against rain, consisting of fabric stretched over hinged ribs radiating from a central rod

the bell-shaped or saucer-shaped largely gelatinous structure that forms the chief part of the body of most jellyfishes

a force or institution that provides protection or cover

(used before a noun) comprising or concerning a broad range of elements or factors

something that covers or embraces a broad range of elements or factors

the Electricity Council: umbrella of the area electricity boards — The Economist

a protective screen, esp of aircraft artillery or gunfire