the circulation of blood from the heart to the lungs for oxygenation and back to the heart.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
The passage of blood from the right ventricle through the pulmonary artery to the lungs and back through the pulmonary veins to the left atrium.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.