Answer:

triptych

AnswerCrossword Clue
TRIPTYCHThree adjoining painted panels
TRIPTYCHThree-part painting
TRIPTYCHThree-paneled artwork
TRIPTYCHThree-panel picture
TRIPTYCHThree-panel painting
TRIPTYCHBosch's "Garden of Earthly Delights," e.g.
TRIPTYCHThree-paneled altarpiece.
TRIPTYCHThree-part art work.
TRIPTYCHPaneled art for an altar
TRIPTYCHBosch's "The Garden of Earthly Delights," for one
TRIPTYCHPicture often used as an altarpiece