( often initial capital letter ) Bible . a sea monster.

any huge marine animal, as the whale.

anything of immense size and power, as a huge, oceangoing ship.

( initial capital letter, italics ) a philosophical work (1651) by Thomas Hobbes dealing with the political organization of society.

noun

behemoth , goliath , jumbo , mammoth , monster , titan , creature , dragon , enormous , giant , large , ship , whale