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blood capillary

n.
  1. One of the minute blood vessels that connect arterioles and venules and are a part of an intricate network throughout the body for the interchange of oxygen, carbon dioxide, and other substances between blood and tissue cells.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.