World English Dictionary
umbrella (ʌmˈbrɛlə)
1.  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: dance umbrella
 b.  (as modifier): an umbrella fund; umbrella group
[C17: from Italian ombrella, diminutive of ombra shade; see umbra]

Collins English Dictionary - Complete & Unabridged 10th Edition
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