·noun Anything consisting of two leaves.
II. Diptych ·noun A picture or series of pictures painted on two tablets connected by hinges. ·see Triptych.
III. Diptych ·noun A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within.
IV. Diptych ·noun A double catalogue, containing in one part the names of living, and in the other of deceased, ecclesiastics and benefactors of the church; a catalogue of saints.