<p><strong>Noun</strong></p><ul><li>a very large person, animal, or thing</li><li>jumbo jet</li><li>a forestaysail having a boom (jumbo boom) along its foot, used especially on schooners</li><li>a sail used in place of a course on a square-rigged ship, having the form of an isosceles triangle set apex downward</li><li>a narrow triangular sail set point downward in place of a foresail on a topsail schooner</li></ul><p><strong>Adjective</strong></p><ul><li>very large: the jumbo box of cereal</li></ul>