This CD-ROM version of the authoritative textbook, used in schools nationwide, offers easy access to more than 12,000 words and definitions, plus audio pronunciations, sound effects and four color illustrations. For each entry, the root word is pronounced, key words within each definition are pronounced and sample sentences are given. Colorful illustrations and fun-filled sound effects enhance the learning experience. Benefits: improves spelling and vocabulary teaches correct pronunciation and usage fun for the whole family.