triptych
noun
[ ˈtrɪptɪk ]
• a picture or relief carving on three panels, typically hinged together vertically and used as an altarpiece.
• "a triptych depicting the Crucifixion"
Origin:
mid 18th century (denoting a set of three writing tablets hinged or tied together): from tri- ‘three’, on the pattern of diptych .
