Leviathan
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Leviathan (/lɨˈvaɪ.əθən/; Hebrew: לִוְיָתָן, Modern Livyatan Tiberian Liwyāṯān ; "twisted, coiled") is a sea monster referenced in the Tanakh, or the Old Testament.
The word has become synonymous with any large sea monster or creature. In literature (e.g., Herman Melville's Moby-Dick) it refers to great whales, and in Modern Hebrew, it means simply "whale". It is described extensively in Job 41 and mentioned in Isaiah 27:1.