ha'-thak (hathakh; Septuagint Hachrathaios):

One of the chamberlains of Ahasuerus, appointed to attend on Esther (Esther 4:5,6,9,10, the King James Version "Hatach"), through whom she learned from Mordecai of Haman's plot.

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'HATHACH'". "International Standard Bible Encyclopedia". 1915.