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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI