Etymology
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diptych (n.)

1620s, "hinged, two-leaved tablet of wood, ivory, etc., with waxed inner surfaces, used by the Greeks and Romans for writing with the style," from Latin diptycha (plural), from late Greek diptykha, neuter plural of diptykhos "double-folded, doubled," from di- "two" (see di- (1)) + ptykhe "fold," which is of uncertain etymology. In art, "a pair of pictures or carvings on two panels hinged together," by 1852.

updated on August 23, 2018

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Definitions of diptych from WordNet

diptych (n.)
a painting or carving (especially an altarpiece) on two panels (usually hinged like a book);
From wordnet.princeton.edu, not affiliated with etymonline.