Fully revised and updated, THE AMERICAN HERITAGE® DICTIONARY OF INDO-EUROPEAN ROOTS remains an indispensable resource for anyone interested in the history of English and its place in the Indo-European language family. More than 13,000 words are traced to their origins in Proto-Indo-European, the prehistoric ancestor of English that was spoken before the advent of writing. In Calvert Watkins's skilled hands, Proto-Indo-European language and society are rendered as alive and compelling as they must have been six thousand years ago. His introductory essay shows how words in an unrecorded ancient language can be reconstructed and offers a wealth of fascinating information about Proto-Indo-European culture. The dictionary that follows contains nearly 1,350 reconstructed roots, plus two dozen new "Language and Culture" notes that explore interesting sidelights to the etymologies presented in many entries.