Blood vessel obstruction is a medical condition in which the flow of blood through the body's vessels is blocked. This can be caused by a CLOT, which is a mass of solidified blood, or by a narrowing of the vessel. The crossword solutions for this term are CLOT (4 letters), VENA (4 letters), AORTA (5 letters), ARTERY (6 letters), ANGIO (5 letters), ARTERIOLE (9 letters), CAVA (4 letters), VEIN (4 letters) and VIAL (4 letters). CLOT, VENA, ARTERY, angio, arteriole, CAVA, VEIN and VIAL all refer to different types of blood vessels, and AORTA refers to the largest ARTERY in the body.