a portable device used for protection against rain, snow, etc, and consisting of a light canopy supported on a collapsible metal frame mounted on a central rod
2.
the flattened cone-shaped contractile body of a jellyfish or other medusa
3.
a protective shield or screen, esp of aircraft or gunfire
4.
anything that has the effect of a protective screen or cover
5.
a.
any system or agency that provides centralized organization or general cover for a group of related companies, organizations, etc