'Dragon' in the Bible

Speak, and thou hast said: Thus said the Lord Jehovah: Lo, I am against thee, Pharaoh king of Egypt! The great dragon that is crouching in the midst of his floods, Who hath said, My flood is my own, And I -- I have made it for myself.

Son of man, lift up a lamentation for Pharaoh king of Egypt, and thou hast said unto him: A young lion of nations thou hast been like, And thou art as a dragon in the seas, And thou comest forth with thy flowings, And dost trouble the waters with thy feet, And thou dost foul their flowings.