Diptych is incorrectly written, and should be written as "Diptych" being its meaning: Work of art that consists of two parts. See: http://www.significadode.org/tr iptico.htm. See: http://www.significadode.org/pol iptico.htm.
DIPTYCH.FOLDED OR ATTACHED ON TWO BOARDS THAT IT OPENS AND CLOSES LIKE A BOOK.