Plant Pathology is an integral part of crop production activities in mlticomponent agricultural system. Much has been written on Plant Pathology but the clear cut understanding of the technical terms has not been described. The above problem including the definition aspect has been solved in this Terminology by way of describing the terms in Simple and lucid manner. Attempts have also been made to describe some of the technical terms used in deferent ways in different sciences such as Plant Pathology, Nematology, Phytobacteriology, phytovirology, Mushormology. The aim of this glossary is to provide the definition an elaboration fo more than 3200 Technical terms of Plant Pathology to the U.G and P.G student. It will guide the research workers, Graduate and post students of Plant Pathology who desire an catch up test on Plant Pathology.