the.com/pulmonary artery

means The vessel that carries deoxygenated blood from the heart's right ventricle to the lungs to pick up oxygen.

from From Latin pulmo, 'lung' (possibly related to an old Indo-European root tied to 'flying' or 'lightness,' since lungs float on water), plus 'artery,' from Greek arteria — originally used for both arteries and the windpipe, since ancient anatomists often found arteries empty after death and assumed they carried air, not blood. The irony: this particular artery is the one artery in the body actually carrying blood headed off to pick up air.