Definition of pulmonary vein
: a valveless vein that returns oxygenated blood from the lungs to the heart
First Known Use of pulmonary vein
Medical Definition of pulmonary vein
: any of usually four veins comprising two from each lung that return oxygenated blood from the lungs to the superior part of the left atrium, that may include three veins from the right lung if the veins from all three lobes of the right lung remain separate, and that may include a single trunk from the left lung if its major veins unite before emptying into the left atrium
Seen and Heard
What made you want to look up pulmonary vein? Please tell us where you read or heard it (including the quote, if possible).