This is the second edition of our interactive Matses-Spanish-English dictionary, expanded with additional entries, definitions, and illustrations. It is designed to be used by Matses who are learning Spanish and by linguists and others who are interested in the Matses language. Definitions are provided in the regional Spanish of Loreto, Peru, in addition to the standard Spanish definitions, when these varieties of Spanish differ. With 4126 entries, 6065 definitions, 1797 sample sentences, 1374 s