|Easton's Bible Dictionary|
A star, a prince at the court of Ahasuerus (Esther 1:14).
Int. Standard Bible Encyclopedia
she'-thar ([shethar]; Codex Vaticanus and Lucian, Sarsathaios; Codex Alexandrinus Sarestheos): One of the "seven princes" at the court of Ahasuerus (Esther 1:14); these princes "sat first in the kingdom" and had the right of entrance to the king's presence at any time, except when he was in the company of one of his wives. (According to Marquart, Fund., 69, Shethar comes from sh-r-sh-th-y with which the Persian siyatis, "joy," is to be compared.) The word has never really been satisfactorily explained; it is presumably Persian.
Shethar (3 Occurrences)
Ezra 5:3 At the same time came to them Tattenai, the governor beyond the River, and Shetharbozenai, and their companions, and said thus to them, Who gave you a decree to build this house, and to finish this wall? (Root in WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
Ezra 6:6 Now therefore, Tattenai, governor beyond the River, Shetharbozenai, and your companions the Apharsachites, who are beyond the River, you must stay far from there. (Root in WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)
Esther 1:14 and the next to him were Carshena, Shethar, Admatha, Tarshish, Meres, Marsena, and Memucan, the seven princes of Persia and Media, who saw the king's face, and sat first in the kingdom), (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)