The all-new Fourth Edition of the American Heritage Dictionary of the English Language offers more information about the language, in a more accessible format, than any other dictionary in its class. And its elegant, inviting design makes it the most handsome reference book on the market. The Editors of the American Heritage Dictionary have added over 10,000 new words and senses. From slang and popular culture to the latest medical, high-tech, and scientific terms, the Fourth Edition's vocabulary has been thoroughly updated to reflect our constantly changing language. Fresh, full-color design. Over 4,000 full-color photographs, drawings, and maps enhance the American Heritage Dictionary"s definitions and make browsing irresistible. Trustworthy usage guidance. The American Heritage Dictionary has distinguished itself for decades by offering clear and comprehensive usage guidance. Hundreds of new and updated Usage Notes, based on the results of surveys sent to the more than 200 scholars and writers who comprise our Usage Panel, help you make informed decisions about usage questions you face every day. More in-depth note features than any other dictionary. Word Histories, Synonym Paragraphs, and Regional Notes explore the language in a breadth and depth unequaled by any other dictionary. All-new Our Living Language Notes. A fascinating new series of Notes illustrates how social factors such as age and ethnicity influence the way our language is shaped by speakers from all walks of life. Unrivaled biographies and geographies. The American Heritage Dictionary has long been known for its expansive treatment of biographical and geographical entries. These informative capsule summaries have been thoroughly updated for the Fourth Edition. Two unique Appendixes. Discover the hidden connections between words in the newly expanded Appendix of Indo-European Roots and in the all-new Appendix of Semitic Roots. The American Heritage Dictionary offers you the most thorough and intriguing view of the history of words to be found in any dictionary.American Heritage Dictionary Editors is the author of 'American Heritage Dictionary of the English Language', published 2000 under ISBN 9780395825174 and ISBN 0395825172.