The Prasastapadabhasya whose real title is Padarthadharmasamgraha is the most important surviving work of classical Vaisesika. Its great popularity which continues today is witnessed by the fact that it exists in numerous editions. Access to and comparison of these different editons has always been hindered by the lack of a word index covering all the existing editions. This book provides such a tool. All readings in all editions are recorded with references to the page numbers in those editions.