(uncountable) Molecular nitrogen (N2), a colorless, odorless gas at room temperature. (countable) A specific nitrogen within a chemical formula, or a specific isotope of nitrogen The two nitrogens are located next to one another on the ring.
An allergist specializes in allergies, asthma, and allergic asthma. Internist. An internist is a doctor who specializes in internal medicine -- the study of diseases in adults, particularly those related to internal organs -- and who has completed three years of training after medical school. Pediatrician.
The Best Pulmonary Doctors. 1  Pulmonology is the field of medicine involving diseases of the lungs and the upper respiratory system, which includes the nose, pharynx and throat. A pulmonary doctor can also be referred to as a pulmonary specialist or a pulmonologist.