venous blood

Medical Dictionary

venous blood n.
Abbr. v
Blood that has passed through the capillaries of various tissues other than the lungs, is found in the veins, in the right chambers of the heart, and in pulmonary arteries, and is usually dark red as a result of a lower content of oxygen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
venous blood

noun
blood found in the veins; "except in the pulmonary vein venous blood is rich in carbon dioxide and poor in oxygen" 
WordNet® 3.0, © 2006 by Princeton University.
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