Diptych

n.	1.	(Roman Antiq.) Anything consisting of two leaves.
	2.	A double catalogue, containing in one part the names of living, and in the other of deceased, ecclesiastics and benefactors of the church; a catalogue of saints.

Noun

1.

diptych - a painting or carving (especially an altarpiece) on two panels (usually hinged like a book)

Domesday Book, abstract, abstraction, account book, address book, adversaria, album, altarpiece, annual, appointment calendar, appointment schedule, blankbook, block print, blotter, calendar, cashbook, catalog, classified catalog, collage, color print, commonplace book, copy, court calendar, cyclorama, daub, daybook, desk calendar, diary, docket, engagement book, engraving, fresco, icon, illumination, illustration, image, journal, ledger, likeness, log, logbook, loose-leaf notebook, memo book, memorandum book, memory book, miniature, montage, mosaic, mural, notebook, pad, panorama, petty cashbook, photograph, picture, pocket notebook, pocketbook, police blotter, print, representation, reproduction, scrapbook, scratch pad, spiral notebook, stained glass window, stencil, still life, table, tableau, tablet, tapestry, triptych, wall painting, workbook, writing tablet, yearbook