The present publication is an up-to-date, authentic and comprehensive dictionary of chemistry, which recognizes that chemistry is a field in its own right, with its own language, and that terms and their definitions are important for professionals and students of chemistry. It aims to provide clear, concise, and correct definitions and descriptions of the terms used in chemistry. The terminology of all the branches of chemistry are included in this work. This work is designed to be a comprehensive reference tool for chemistry professionals, students and laymen interested in chemistry. It is earnestly hoped that it will be an authoritative source to which one can turn with confidence for meaning and knowledge of the common, specialized and latest terms in chemistry and allied fields.