narrowing of either the pulmonary valve—the valve through which blood flows from the right ventricle, or lower chamber, of the heart on its way to ... [2 related articles]
<cardiology> A congenital or acquired heart valve defect. The abnormal narrowing and ineffective opening of the pulmonic valve. ... Symptoms include cyanosis and difficulty breathing. Treatment is surgical in most cases of significant valvular stenosis. ... (27 Sep 1997) ... 
(PS) narrowing of the pulmonary valve between the pulmonary artery and the right ventricle.
Type: Term Definitions: 1. narrowing of the opening into the pulmonary artery from the right ventricle.
Pulmonary stenosis: The pulmonary valve is too tight so that the flow of blood from the right ventricle of the heart into the pulmonary artery is impeded. This means the right ventricle must pump harder than normal to overcome the obstruction. If the stenosis is severe, babies may become blue (cyanotic). Older children often have no symptoms. Treat...
[n] - abnormal narrowing of the opening into the pulmonary artery from the right ventricle
obstruction of the flow of blood from the heart to the lungs 
noun abnormal narrowing of the opening into the pulmonary artery from the right ventricle