Since 1898, Dorlands Pocket Medical Dictionary has continuously maintained the standard as the worlds most convenient, user-friendly, portable reference on medical terminology. Thoroughly revised to reflect the latest advances in medicine, this 28th edition delivers the accurate, clear, up-to-date definitions you expect from Dorlands - in a highly compact, easy-to-use format. Bonus software lets you add hundreds of thousands of medical terms to your computers spell-checker.