Easton's Bible Dictionary (1897)
The master of the eunuchs of Nebuchadnezzar (Dan. 1:3), the “Rabsaris” of the court. His position was similar to that of the Kislar-aga of the modern Turkish sultans.
Smith's Bible Dictionary (1863)
(horse-nose), the master of the eunuchs of Nebuchadnezzar. (Daniel 1:3)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ASH'PENAZ (horse-nose?), the master of Nebuchadnezzar's eunuchs, who showed much kindness and forbearance toward Daniel and his three companions, though at considerable personal risk. Dan 1:3.