Malachi

Malachi, a prophetic book of the Old Testament, the author of which is otherwise unknown, as the name, which means the “Messenger of Jehovah,” occurs nowhere else in the Bible, and it is a question whether the name is that of a person or a mere appellative; the prophecy it contains appears to have been uttered 420 B.C., and refers to abuses which came to a head between the first and second visits of Nehemiah to Jerusalem; it lacks the old prophetic fire, and gives the impression that the prophetic office is ended.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)