a very large person, animal, or thing.

jumbo jet.

U.S. Nautical .

a forestaysail having a boom (jumbo boom) along its foot, used esp. on schooners.

a sail used in place of a course on a square-rigged ship, having the form of an isosceles triangle set apex downward.

a narrow triangular sail set point downward in place of a foresail on a topsail schooner.

very large

the jumbo box of cereal.

adjective

little , mini , miniature , small , tiny

adjective

colossal , cyclopean , elephantine , giant , huge , immense , large , mammoth , mighty , oversized , prodigious , behemoth , brobdingnagian , bunyanesque , enormous , gargantuan , gigantesque , gigantic , herculean , heroic , massive , massy , mastodonic , monster , monstrous , monumental , mountainous , pythonic , stupendous , titanic , tremendous , vast

noun

behemoth , goliath , leviathan , mammoth , monster , titan