A pediatrician dedicated to the prevention and treatment of all respiratory diseases affecting infants, children and young adults. This specialist is knowledgeable about the growth and development of the lung, assessment of respiratory function in infants and children, and experienced in a variety of invasive and noninvasive diagnostic techniques. Source: American Board of Medical Specialties, 2007. www.abms.org [7/1/2007: definition added, source added; 7/1/2011: modified source]