a light, small, portable, usually circular cover for protection from rain or sun, consisting of a fabric held on a collapsible frame of thin ribs radiating from the top of a carrying stick or handle.
the saucer- or bowl-shaped, gelatinous body of a jellyfish; bell.
something that covers or protects from above, as military aircraft safeguarding surface forces: an air umbrella.
any general kind of protection: a price umbrella.
something, as an organization or policy, that covers or encompasses a number of groups or elements.
shaped like or intended to perform the function of an umbrella.
having the quality or function of covering or applying simultaneously to a number of similar items, elements, or groups: an umbrella organization; umbrella coverage in an insurance policy.

1600–10; 1965–70 for def 7; < Italian ombrella, earlier variant of ombrello < Late Latin umbrella, alteration (with influence of Latin umbra shade) of Latin umbella sunshade. See umbel

umbrellaless, adjective
umbrellalike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1609, first attested in Donne's letters, from It. ombrello, from L.L. umbrella, altered (by influence of umbra) from L. umbella "sunshade, parasol," dim. of umbra "shade, shadow" (see umbrage). A sunshade in the Mediterranean, a shelter from the rain in England; in late
17c. usage, usually as an Oriental or African symbol of dignity. Said to have been used by women in England from c.1700; the first rain-umbrella carried by a man there was traditionally c.1760, by Jonas Hathaway, noted traveler and philanthropist. Fig. sense of "authority, unifying quality" (usually in a phrase such as under the umbrella of) is recorded from 1948.
Online Etymology Dictionary, © 2010 Douglas Harper
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