This is the fullest account ever published of Latin suffixes in English. It explores the rich variety of English words formed by the addition of one or more Latin suffixes, such as ial, -able, -ability, -ible, and -id. It traces the histories of over 3,000 words and reveals the range of derivational patterns in Indo-European, Latin, and English. It makes an important contribution to the history of English and Latin morphology and etymology, as well as to the history of suffixal derivation in Indo-European.