triptych, triptych on

[Gr. triptych on, from tri- =three, and ptyx (gen it. ptychos )=a fold, a folding.] 1. A writing tablet in three parts, two of which might be folded over the middle part; hence, sometimes, a book or treatise in three parts or sections. 2. A picture, carving, or other representation, generally on panel, with two hanging doors or leaves, by which it could be closed in front. Triptychs were constructed of various materials and dimensions; ivory and enameled triptychs were adorned with sacred subjects and emblems. They were frequently used for altar-pieces. The central figure is usually complete in itself. The subsidiary designs on either side of it are smaller, and frequently correspond in size and shape to one-half of the principal picture.