(historical) A book, in diary form, in which one's friends enter their birthdates in their own handwriting.

plural of birthday book

A smooth form of the Pahlavi script in which letters are joined to each other and often form complicated ligatures.

(authorship) A series of public events performed by authors in order to promote a newly-released book, including book signings, media appearances, etc.

plural of field book

A reference book containing practical information prepared by, or intended for, people doing fieldwork.

(derogatory) playing cards, regarded as sinful because of the connection with gambling

plural of book number

A unique number which identifies a published book, for example, an ISBN.

plural of book-token