Easton's Bible Dictionary (1897)
(a Persian word meaning “ass-driver”), one of the seven eunuchs or chamberlains of king Ahasuerus (Esther 1:10; 7:9).
Smith's Bible Dictionary (1863)
(ass-driver), the third of the seven chamberlains or eunuchs who served King Ahasuerus.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
HARBO'NA (ass-driver), a eunuch of Ahasuerus, Esth 1:10.