spine : The outer portion of a book which covers the actual binding. The spine usually faces outward when a book is placed on a shelf. Also known as the back.

foxed : A discoloration to paper, brown and yellowish spots.

8vo : Short for Octavo, A book whose page size is approximately 8-10 inches tall. The size is based on a sheet of paper 25 inches by 38 inches, the size of paper traditionally used by book printers, which has been folded and cut into 16 pages.. Unfortunately often misunderstood to mean 8 volumes.

endpapers : The first and last two pages (verso and recto) from the front and back of a book.

Cloth : Generally refers to a hardcover with cloth covering the outside of the book covers.