blood vessel

This term serves as a collective anatomical category encompassing arteries, veins, and capillaries. In medical and scientific discourse, it is used to describe the entire circulatory network, whereas more specific terms are used when the direction of blood flow or the size of the tube is relevant.

Because it is a compound noun, the pluralization occurs on the second element. It is almost exclusively used in clinical, biological, or emergency medical contexts, such as describing a rupture or a blockage, and rarely appears in casual conversation unless referring to a specific injury.