Dictionary of Biology has been compiled to meet the needs of students of Biology at all levels. An attempt has also been made to write the entries in a clear and lucid style to provide both straight forward definitions and invaluable background informations, clear and easy illustrations have been included wherever the meaning of a word can be best understood. Though the authors have taken special care to cover all important and basic terms, yet they are fully aware about their limitations. The selection of the terms is a problem in such a project and it has been the aim of the authors to strike a good balance. The dictionary will be of immense value of students of Biology and to Naturalists, Geographics and others studying or working in the related fields. This dictionary could be considered as a commendable achievement by any standards