jumbo: Meaning and Definition of

jum•bo

1. a very large person, animal, or thing.
2. See
1. a forestaysail having a boom(jum&prim;bo boom&sec;)along its foot, used esp. 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.

1. very large: the jumbo box of cereal.