Diptych (noun)

1. A piece of art or a writing consisting of two panels or leaves that are hinged together and can be opened like a book.
2. A two-leaved hinged writing tablet used in the ancient times for wax tablets or papyrus.
3. An artwork or a religious relic made of two panels, usually painted or carved and hinged together.

Origin:

From late latin diptychum, from ancient greek δίπτυχον (díptukhon), from δίς (dis, 'two') + πτύχος (ptúkhos, 'fold').

Examples:

1. The beautiful oil painting was part of a diptych, with its twin piece hanging on the wall opposite to it.
2. The medieval diptych was made of carved ivory, and depicted scenes from the life of Christ.
3. The artist was inspired by a diptych he saw at the museum, and decided to create his own modern version of the ancient format.
4. The diptych was a valuable religious artifact, believed to bring blessings and protection to its owner.
5. The art historian was fascinated by the diptych, as it was a rare example of a Renaissance piece that had survived the centuries.