dust jacket : A protective and often decorative wrapper, usually made of paper which wraps around the binding of a book.

vg : Very Good condition. can describe a used book that does show some small signs of wear - but no tears - on either binding or paper. Any defects must be noted. (defined by AB Bookman's Weekly)

tight : Used to mean that the binding of a book has not been overly loosened by frequent use.

8vo : Short for Octavo, A book whose page size is approximately 12 inches by 9 inches. 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.