(the great eagle ) an idol of Nineveh, in whose temple Sennacherib was worshipping when assassinated by his sons, Adrammelech and Shizrezer. (2 Kings 19:37; Isaiah 37:38) This idol is identified with the eagle-headed human figure, which is one of the most prominent on the earliest Assyrian monuments, and is always represented as contending with and conquering the lion or the bull.
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Smith, William, Dr. "Entry for 'Nis’roch'". "Smith's Bible Dictionary".