1. (n.) Anything consisting of two leaves.

2. (n.) A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within.

3. (n.) A picture or series of pictures painted on two tablets connected by hinges. See Triptych.

4. (n.) 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.

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