Hinged pair of pictures

• Ancient two-leaved tablet
• A painting or carving (especially an altarpiece) on two panels (usually hinged like a book)

Wiktionary Word definitions in Wiktionary
n. 1 A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within. 2 (context arts English) A picture or series of pictures painted on two tablets, usually connected by hinges. ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1620s, from Latin diptycha (plural), from late Greek diptykha , neuter plural of diptykhos "double-folded, doubled," from dis- "two" + ptykhe "fold."

Wikipedia Word definitions in Wikipedia
A diptych (; from the Greek δίπτυχον, di "two" + ptychē "fold") is any object with two flat plates attached at a hinge . In particular the standard notebook and school exercise book of the ancient world was the diptych consisting of a pair of such plates ...

WordNet Word definitions in WordNet
n. a painting or carving (especially an altarpiece) on two panels (usually hinged like a book)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Diptych \Dip"tych\, n. [L. diptycha, pl., fr. Gr. ? folded, doubled; di- = di`s- twice + ? to fold, double up.] Anything consisting of two leaves. Especially: (Roman Antiq.) A writing tablet consisting of two leaves of rigid material connected by hinges ...