|Int. Standard Bible Encyclopedia|
big'-than big-tha'-na (bighethan, bighethana'; Septuagint omits name): One of the two chamberlains or eunuchs of Xerxes on ("Ahasuerus") who conspired against the king's life, the conspiracy being detected by Mordecai and the culprits hanged (Esther 2:21). Possibly these men had been partially superseded by the degradation of Vashti and were thus prompted to take revenge Xerxes.
Bigthana (2 Occurrences)
Esther 2:21 in those days, while Mordecai sat in the king's gate, two of the king's chamberlains, Bigthan and Teresh, of those that kept the door, were wroth, and sought to lay hands on the king Ahasuerus. (See NIV)
Esther 6:2 It was found written that Mordecai had told of Bigthana and Teresh, two of the king's eunuchs, who were doorkeepers, who had tried to lay hands on the King Ahasuerus. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)