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Parabema, par-a-bē′ma, n. in Byzantine ecclesiastical architecture, the chapel of the prothesis or the diaconicon, or sacristy, where divided by walls from the bema or sanctuary:—pl.

Diaconicon, dī-a-kon′i-kon, n. a sacristy for sacred vessels, in a Greek church, on the south side of the bema or sanctuary.

On the east side the Diaconicon and Prothesis are included in the width of the domed portion instead of forming the eastern termination of the aisles.

The churches are all orientated, and have generally a semi-circular apse, and occasionally a square or rectangular sanctuary at the east end, on either side of which are square chambers,—the diaconicon, reserved for the priests, on the south side, and the prothesis, on the north side, in which the offerings of the faithful were deposited.

The spaces thus marked off were probably prothesis and diaconicon, the latter being to the left, where the two deacons gave the pavement.