Толковый словарь английского языка - diptych

noun Etymology: Late Latin ~a, plural, from Greek, from neuter plural of ~os folded in two, from di+ ptychē fold Date: 1622 a 2-leaved hinged tablet folding together to protect writing on its waxed surfaces, a picture or series of pictures (as an altarpiece) painted or carved on two hinged tablets, a work made up of two matching parts