Trip'tych, n.

n. [Gr. τρι, τρίς, three, thrice, and πτύξ, a fold or leaf.] 1. A writing-tablet in three parts, two of which folded over on the middle part; hence, sometimes, a book or treatise in three parts or sections. Fosbroke. 2. An altar-piece in three compartments, the middle one affixed to the wall, and the other two folding on this.