leviathan

Something unusually large of its kind, especially a ship.

A very large animal, especially a whale.

A monstrous sea creature mentioned in the Bible.

An aquatic animal mentioned in the Old Testament.

Hence, in modern use Any great or monstrous marine animal, as the whale.

Anything of vast or huge size.

An aquatic animal, described in the book of Job, ch. xli., and mentioned in other passages of Scripture.

The whale, or a great whale.

Very large; gargantuan.

A large sea monster which guards the gates of hell at the bottom of the sea.