le·vi·a·than /lɪˈvaɪəθən/
 海中怪獸,巨物
 Le·vi·a·than n.
 1. An aquatic animal, described in the book of Job, ch. xli., and mentioned in other passages of Scripture.
 Note: ☞ It is not certainly known what animal is intended, whether the crocodile, the whale, or some sort of serpent.
 2. The whale, or a great whale.
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 leviathan
      n 1: the largest or most massive thing of its kind; "it was a
           leviathan among redwoods"; "they were assigned the
           leviathan of textbooks"
      2: monstrous sea creature symbolizing evil in the Old Testament
 Leviathan
    a transliterated Hebrew word (livyathan), meaning "twisted,"
    "coiled." In Job 3:8, Revised Version, and marg. of Authorized
    Version, it denotes the dragon which, according to Eastern
    tradition, is an enemy of light; in 41:1 the crocodile is meant;
    in Ps. 104:26 it "denotes any large animal that moves by
    writhing or wriggling the body, the whale, the monsters of the
    deep." This word is also used figuratively for a cruel enemy, as
    some think "the Egyptian host, crushed by the divine power, and
    cast on the shores of the Red Sea" (Ps. 74:14). As used in Isa.
    27:1, "leviathan the piercing [R.V. 'swift'] serpent, even
    leviathan that crooked [R.V. marg. 'winding'] serpent," the word
    may probably denote the two empires, the Assyrian and the
    Babylonian.