Definition of "epicardium" []

• The inner layer of the pericardium that is in actual contact with the surface of the heart. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Inside the epicardium is the myocardium, the middle layer of the heart wall, composed of cardiac muscle."
• "OED 2nd edition: epicanthus epicardium epicarp but no epicaricacy."
• "The entire heart is wrapped in a membrane known as the epicardium."