Histology Microanatomy C0019638 histology The study of the structure of the cells and their arrangement to constitute tissues and, finally, the association among these to form organs. In pathology, the microscopic process of identifying normal and abnormal morphologic characteristics in tissues, by employing various cytochemical and immunocytochemical stains. FDA Histology Histology GDC Histology Biomedical Occupation or Discipline The study of tissues and cells under a microscope. Histology C16681 Pharmacology: Primary Pharmacodynamics