Easton's Bible Dictionary (1897)
” If a proper name, it may denote some place near the western extremity of the valley here spoken of near Jerusalem.
Smith's Bible Dictionary (1863)
a name only occurring in (Zechariah 14:5) It is mentioned as the limit to which the ravine of the Mount of Olives will extend when “Jehovah shall go forth to fight.”
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
A'ZAL. Zech 14:5. As the passage reads in the margin, Azal is not a proper name; but if a place at all, it was on or near Mount Olivet.