/ ˈdʒʌmbəʊ; NAmE -boʊ/ noun , adjective
■ noun
( pl. -os ) (also ˌjumbo ˈjet ) a large plane that can carry several hundred passengers, especially a Boeing 747
■ adjective
[ only before noun ] ( informal ) very large; larger than usual :
a jumbo pack of cornflakes
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WORD ORIGIN
early 19th cent. (originally of a person): probably the second element of mumbo-jumbo . Originally denoting a large and clumsy person, the term was popularized as the name of an elephant at London Zoo, sold in 1882 to the Barnum and Bailey circus.