Dip'tych or Dip'ty-chium, n.

n. [Gr. δίπτυχος, folded, doubled, from δί, for δίς, twice, double, and πτύσσειν, to fold, double up.]

1. A folded writing tablet among the ancients, usually consisting of two leaves; especially, such a tablet containing the name and portrait of a magistrate under the Roman empire, and distributed by him on the day of his entering office. W. Smith.
2. A double catalogue, containing in one part the names of living, and in the other those of deceased ecclesiastics and benefactors of the church, which is rehearsed in the Greek liturgy; a catalogue of saints.