jumbo

[juhm-boh] Informal.
noun, plural jumbos.
1.
a very large person, animal, or thing.
3.
U.S. Nautical.
a.
a forestaysail having a boom (jumbo boom) along its foot, used especially on schooners.
b.
a sail used in place of a course on a square-rigged ship, having the form of an isosceles triangle set apex downward.
c.
a narrow triangular sail set point downward in place of a foresail on a topsail schooner.
adjective
4.
very large: the jumbo box of cereal.

Origin:
1800–10; origin uncertain; popularized as the name of a large elephant purchased and exhibited by P.T. Barnum in 1882

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jumbo (ˈdʒʌmbəʊ)
 
n , pl -bos
1.  informal
 a.  a very large person or thing
 b.  (as modifier): a jumbo box of detergent
2.  See jumbo jet
 
[C19: after the name of a famous elephant exhibited by P. T. Barnum, from Swahili jumbe chief]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

jumbo
"very large," 1897, Amer.Eng., in ref. to Jumbo, name of the London Zoo's huge elephant, sold Feb. 1882 to U.S. circus showman P.T. Barnum. The name is probably from slang jumbo "clumsy, unwieldy fellow" (1823), which itself is possibly from a word for "elephant" in a W.African language (cf. Kongo nzamba).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
That's the equivalent of six jumbo jet crashes a day for an entire year.
From large through extra-large to jumbo, there's an orderly progression of
  prices, with a premium for color.
If there's aren't construction workers there buying jumbo coffees and maple
  bars, it's not a real donut shop.
But we're not going to criticize the penmanship involved in writing with a
  jumbo jet.
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