- the serous membrane that lines the cavities of the heart.
Origin of endocardium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the membrane that lines the cavities of the heart and forms part of the valves
C19: from New Latin, from endo- + Greek kardia heart
- The thin serous membrane, composed of endothelial and subendothelial tissue, that lines the interior of the heart.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.