[dip.tych] n [LL diptycha, pl., fr. Gk, fr. neut. pl. of diptychos folded in two, fr. di- + ptyche fold] (1622) 1: a 2-leaved hinged tablet folding together to protect writing on its waxed surfaces
2: a picture or series of pictures (as an altarpiece) painted or carved on two hinged tablets
3: a work made up of two matching parts