A subspecialty of pathology applied to the solution of clinical problems, especially the use of laboratory methods in clinical diagnosis. (Dorland, 28th ed.)
Study of the scientific principles, mechanisms, and effects of the interaction of ionizing radiation with living matter. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A medical specialty concerned with maintaining health and providing medical care to children from birth to adolescence.
A medical specialty concerned with the skin, its structure, functions, diseases, and treatment.