This Molecular Dictionary App is aimed to provide instant search for basic information in molecular genetics findings for each entity in Pathology. The main targeted users are medical students and residents. There are two search functions, 'Search by genetics' and 'Search by entities'. The content of Hematopathology was based on 'WHO Classification of Tumours of Haematopoietic and Lymphoid Tissue - Revised 4th Edition, 2017'. The information will be updated later once the new version of WHO classification is published. The content for other subspecialties is coming soon. The information of this dictionary is for quick reference only and should not be used for clinical diagnosis. Currently the app is in beta version. Feedback is welcomed.