This book is based on linguistic research conducted by Duili— Vai‡ for several years. Before dying, Duili— Vai‡ gave us the manuscript on a Spanish dictionary to Ta’no. In his honor and that of his wife Mary we decided to publish it. We add information on the prehistoric cultures of Puerto Rico, biographical data of Duili— Vai‡, photos of prehistoric objects and a recount of the archaeological experiences of the editor Luis Antonio Rodr’guez V‡zquez. The book contains more than 300 words of the Ta’no language and its equivalent to Spanish