[ juhm-boh ]
/ ˈdʒʌm boʊ /

noun, plural jum·bos.

a very large person, animal, or thing.
U.S. Nautical.
  1. a forestaysail having a boom (jumbo boom) along its foot, used especially on schooners.
  2. a sail used in place of a course on a square-rigged ship, having the form of an isosceles triangle set apex downward.
  3. a narrow triangular sail set point downward in place of a foresail on a topsail schooner.


very large: the jumbo box of cereal.

Origin of jumbo

First recorded in 1800–10; origin uncertain; popularized as the name of a large elephant purchased and exhibited by P.T. Barnum in 1882
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for jumbo

British Dictionary definitions for jumbo

/ (ˈdʒʌmbəʊ) /

noun plural -bos

  1. a very large person or thing
  2. (as modifier)a jumbo box of detergent

Word Origin for jumbo

C19: after the name of a famous elephant exhibited by P. T. Barnum, from Swahili jumbe chief
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012