pulmonary thromboendarterectomy /ˈpʊlməˌnɛri ˌθrɒmboʊˌɛndɑːrtəˈrɛktəmi/ noun1 •A surgery that removes chronic blood clots and scar tissue from the pulmonary arteries to treat chronic thromboembolic pulmonary hypertension, with the goal of restoring blood flow in the lungs and lowering pulmonary artery pressure.