C14: from Late Latin, ultimately from Hebrew liwyāthān, of obscure origin
leviathan for learners of EnglishPowered by COBUILD (lɪvaɪəθən)
Word forms: leviathans
countable noun [usu sing]
A leviathan is something which is extremely large and difficult to control, and which you find rather frightening. [literary] ⇒ Democracy survived the Civil War and the developing industrial leviathan and struggled on into the twentieth century.