Leviathan
Pronunciation : Le*vi"a*than
Part of Speech : n.
Etymology : [Heb. livyathan.]
Definition : 1. An aquatic animal, described in the book of Job, ch. xli., and mentioned on 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. Milton.
Source : Webster's Unabridged Dictionary, 1913