blood vessel

noun
any of the vessels, as arteries, veins, or capillaries, through which the blood circulates.

Origin:
1685–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
blood vessel
 
n
an artery, capillary, or vein

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

blood vessel n.
An elastic tubular channel, such as an artery, a vein, a sinus, or a capillary, through which the blood circulates.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
blood vessel  
An elastic tube or passage in the body through which blood circulates; an artery, a vein, or a capillary.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

blood vessel

a vessel in the human or animal body in which blood circulates. The vessels that carry blood away from the heart are called arteries, and their very small branches are arterioles. Very small branches that collect the blood from the various organs and parts are called venules, and they unite to form veins, which return the blood to the heart. Capillaries are minute, thin-walled vessels that connect the arterioles and venules; it is through the capillaries that nutrients and wastes are exchanged between the blood and body tissues. See artery; capillary; vein

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It was discovered when a blood vessel in the tumor burst creating all the
  symptoms of a stroke.
Diuretics cause the kidneys to remove sodium and water from the body, thereby
  alleviating pressure on the blood vessel walls.
The end result is a blood vessel clogged with clumps of fat.
In addition, the endothelium acts as a barrier to prevent toxic substances from
  entering the blood vessel's wall.
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