umbrella

A cloth-covered frame used for protection against rain or sun.

Generally, anything that provides protection.

Something that covers a wide range of concepts, purposes, groups, etc.

The main body of a jellyfish, excluding the tentacles.

(photography, television) An umbrella-shaped reflector with a white or silvery inner surface, used to diffuse a nearby light.

Umbrella bridge, a bridge in more than one direction. An umbrella bridge was built over Oxford Circus in 1963 to allow traffic to drive over it while excavation took place below it to create a new ticket hall for the London Underground as part of construction of the Victoria Line.