Easton's Bible Dictionary (1897)
Vision of God, the father of Joel the prophet (Joel 1:1).
Smith's Bible Dictionary (1863)
(vision of God), the father of the prophet Joel. (Joel 1:1) (B.C. before 800.)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
PETHU'EL (vision of God), or perhaps METHU'EL(peace of God), the father of the prophet Joel. Joel 1:1.
Hitchcock's Bible Names (1869)
mouth of God; persuasion of God