This illustrated dictionary of entomology is published for the benefit of primarily amateur biologist with an interest in insects and for all those who desires to understand the science of entomology. The technical words related to the various disciplines of entomology such as morphology, anatomy physiology, systematic, ecology, pest management and general entomology have been included in this dictionary and where ever possible the technical meaning of these words have been clarified with the help of labeled diagram. Efforts have been made to define the entomological terms in a simple manner in order to make them understandable by the student of entomology and all those who are not the experts of entomology rather they encounter such technical works while dealing with the related literature and fail to find their meaning in general English dictionaries.