'Triptych' definitions:

Definition of 'triptych'

(from WordNet)
noun
Art consisting of a painting or carving (especially an altarpiece) on three panels (usually hinged together)

Definition of 'Triptych'

From: GCIDE
  • Triptych \Trip"tych\, n. [Gr. ? consisting of three layers or plates; ? (see Tri-) + ?, ?, a fold, layer.] Anything in three parts or leaves. Specifically: (a) A writing tablet in three parts, two of which fold over on the middle part. [1913 Webster] (b) A picture or altarpiece in three compartments. [1913 Webster]

Synonyms of 'triptych'

From: Moby Thesaurus