polyptych
A work consisting of multiple painted or carved panels joined together, often with hinges.
[...], a polyptych is a painting with more than one section – a diptych is a painting in two parts or sections, a triptych in three, and so on. Perhaps the most famous polyptych is the Ghent Altarpiece by the early Flemish painters Hubert and Jan van Eyck.
Where it comes from
From Ancient Greek πολύπτυχος (polúptukhos, “with many folds”), from πολύς (polús, “many”) + πτυχή (ptukhḗ, “a fold”).
Adapted from the Wiktionary entry polyptych (CC BY-SA 4.0).