Fully revised and updated based on the latest linguistic research, the "American Heritage Dictionary of Indo-European Roots, Third Edition" by distinguished professor Calvert Watkins traces over 13,000 words representing nearly 1,350 basic roots to their origins in Proto-Indo-European, the prehistoric ancestor of English. The dictionary includes an introductory essay by Dr. Watkins, explaining how it is possible to reconstruct the words of an ancient and unwritten language and describing what scholars have discovered about Proto-Indo-European culture. Interspersed throughout the body of the dictionary are Language and Culture notes that provide more detailed information on particularly interesting roots and the vocabulary derived from them. The Dictionary of Indo-European Roots is an indispensable resource for anyone interested in the history of English and its place within the Indo-European language family.