Thayer's Greek Lexicon

 1. a repository of treasure, especially of public treasure, a treasury

It is used to describe the apartments constructed in the courts of
the temple, in which the not only the sacred offerings and things
needful for the service were kept, but in which the priests, etc,
dwelt: Neh. 13:7; of the sacred treasury in which not only treasure
but also public records were stored, and the property of widows and
orphans was deposited. Josephus speaks of treasuries in the women's
court of Herod's temple. In the N.T. near the treasury seems to used
of that receptacle mentioned by the rabbis to which were fitted
thirteen chests or boxes, i.e. trumpets, so called from their shape,
and into which were put the contributions made voluntarily or paid
yearly by the Jews for the service of the temple and the support of
the poor.