I. jum ‧ bo /ˈdʒʌmbəʊ $ -boʊ/ BrE AmE adjective [only before noun] informal
[ Date: 1800-1900 ; Origin: Jumbo , name of a very large elephant put on show in London and the U.S. in the 19th century, perhaps from mumbo-jumbo ]
larger than other things of the same type:
jumbo-sized hot dogs
II. ˈjumbo jet BrE AmE ( also jumbo ) noun [countable]
a very large plane for carrying passengers