Question

What you mean by pulmonary veins?

Answer 1

Veins that do actually do the work that is opposite to its nature. That is normal  veins usually carry de-oxygenated blood but the specialty of these veins is that they carry oxygenated blood from the lungs to the heart. they drain the blood into the left atrium. Their are 4 pulmonary veins, two from each lung.

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Answer 2

One of four vessels that carry aerated blood from the lungs to left atrium of the heart. The pulmonary veins are the only veins that carry bright-red oxygenated BLOOD.