leviathan (le¦via|than)

noun

• (in biblical use) a sea monster, identified in different passages with the whale and the crocodile (e.g. Job 41, Ps. 74:14), and with the Devil (after Isa. 27:1).
• a very large aquatic creature, especially a whale: the great leviathans of the deep
• a thing that is very large or powerful, especially an organization or vehicle: it’s a challenge to navigate a wheeled leviathan in rush-hour traffic
• an autocratic monarch or state: we must tame the state Leviathan

  [with allusion to Hobbes's Leviathan (1651)]