leviathan Meaning, Definition & Usage

  1. noun the largest or most massive thing of its kind
    • it was a leviathan among redwoods
    • they were assigned the leviathan of textbooks
  2. noun monstrous sea creature symbolizing evil in the Old Testament

WordNet

Le*vi"a*than noun
Etymology
Heb. livyathan.
Definitions
  1. An aquatic animal, described in the book of Job, ch. xli., and mentioned on other passages of Scripture. ✍ 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. Milton.

Webster 1913