thas'-i (Codex Venetus Thassei; Codex Vaticanus Thassis):
The surname of Simon, the brother of Judas Maccabeus (1 Macc 2:3; Syriac "Tharsi"). It is uncertain what the name means, perhaps "director" or "guide," since Simon was "a man of counsel," or "the zealous."
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Orr, James, M.A., D.D. General Editor. "Entry for 'THASSI'". "International Standard Bible Encyclopedia". <http://classic.studylight.org/enc/isb/view.cgi?number=T8711>. 1915.