What is Leviathan?

LEVIATHAN (Hebrew) is compounded of two words meaning a great fish and fastened; hence it probably means a huge fish covered with close scales. The Septuagint renders it drakon (a dragon), and ketos (a whale). From the description of it given in the book of Job (xli) it is usually, and probably correctly, considered to mean the crocodile, though in some places it has been interpreted the whale.