In this book, the derivation of 4350 Persian words from Indo-European and other roots is demonstrated graphically in little charts, like family trees. They are organized alphabetically to serve as a Persian dictionary. The bilingual descriptions inside the charts are mainly in English. Bibliographic references are provided. A word index is provided for each language that has had an impact on the formation of Persian words. The original meanings of words or roots are also provided along with their current usage.