diptych

noun

1. 1

   A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within.

2. 2

   A picture or series of pictures painted on two tablets, usually connected by hinges.

3. 3

   A double catalogue, containing in one part the names of living, and in the other of deceased, ecclesiastics and benefactors of the church.

4. 4

   A catalogue of saints.

5. 5

   Artistically-wrought tablets distributed by consuls, etc. of the later Roman Empire to commemorate their tenure of office; hence transferred to a list of magistrates