triptych
US /ˈtrɪp.tɪk/
UK /ˈtrɪp.tɪk/
1.
a picture or relief carving on three panels, typically hinged together side by side and used as an altarpiece.
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The artist displayed a beautiful triptych depicting scenes from nature.
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The museum acquired an ancient religious triptych for its collection.
2.
a set of three associated literary or artistic works.
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The director completed his film triptych with the release of the final movie.
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Her latest novel is part of a literary triptych exploring themes of identity.