The present dictionary is an effort to acquaint the readers with the essentials of the Science of biology, its basic concept and foundations. The main aim is to enable the readers to comprehend the wide-range depth and Knowledge of Biology in a lucid manner, thus allowing for an understanding of biology which fosters the development of a well-informed mind. Updated with the latest information in Biological research, the dictionary also boasts of detailed diagrams and illustrations which should prove useful for providing Visual information for the readers. It is hoped that the comprehensive and lucid content of the dictionary proves to be resourceful for all.