le ‧ vi ‧ a ‧ than /lɪˈvaɪəθ ə n/ BrE AmE noun [countable] literary
[ Date: 1300-1400 ; Origin: Leviathan a very large sea animal in the Bible, from Late Latin , from Hebrew liwyathan ]
1 . something very large and strong:
a leviathan of a ship
2 . a very large and frightening sea animal