trade paperback : Often used to indicate any paperback book that is somewhat larger than a mass-market paperback.

reprint : Any printing of a book which follows the original edition. By definition, a reprint is not a first edition.

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.