|Easton's Bible Dictionary|
Lord of palm trees, a place in the tribe of Benjamin near Gibeah of Saul (Judges 20:33). It was one of the sanctuaries or groves of Baal. Probably the palm tree of Deborah (Judges 4:5) is alluded to in the name.
Int. Standard Bible Encyclopedia
ba-al-ta'-mar ba`al tamar; Baal Thamar, ("Baal of the palm tree"): Evidently a seat of heathen worship (Judges 20:33) between Bethel and Gibeah (compare Judges 20:18, 31). The place was known to Eusebius (Onomasticon, which see), but trace of the name is now lost. Conder suggests that it may be connected with the palm tree of Deborah (Judges 4:5) which was between Bethel and Ramah (HDB, under the word).
Baal-tamar (1 Occurrence)
Judges 20:33 And all the men of Israel rose up out of their place, and set themselves in array at Baal-tamar: and the liers-in-wait of Israel brake forth out of their place, even out of Maareh-geba. (ASV BBE JPS WBS YLT NAS)