American Dictionary of the English Language

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DIPTYCH, noun [Gr., to fold.] A public register of the names of consuls and other magistrates among pagans; and of bishops, martyrs and others, among Christians; so called because it sometimes two leaves folded, but is sometimes contained three or more leaves. The sacred diptych was a double catalogue, in one of which were registered the names of the living, and in the other the names of the dead, which were to be rehearsed during the office.