The book block is the whole of the matter of a book once it is bound and ready for the final stages of completion. This is my ~ modern ~ understanding, suitable for this page on this site. There might be confusion with other definitions ~ noted at the foot of this page.
The block will require attention to the back ~ the swell ~ trimming ~ attaching the boards ~ covering them ~ and finishing.
[117520] [117523] [117524]A carved piece of wood that is made to fit on a printing press is also called a bookblock. I do not have any samples to illustrate this. Wikipedia has an interesting article on bookblocks of this type, and also ~ yet another definition ~ block books [Wiki]