noun, plural pericardia [per-i-kahr-dee-uh] . Anatomy.
the membranous sac enclosing the heart.

1570–80; < Neo-Latin < Greek perikárdion, noun use of neuter of perikárdios surrounding the heart, equivalent to peri- peri- + kardios, adj. derivative of kardía heart; cf. -cardium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pericardium (ˌpɛrɪˈkɑːdɪəm)
n , pl -dia
the membranous sac enclosing the heart
[C16: via New Latin from Greek perikardion, from peri- + kardia heart]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1570s, Latinized form of Gk. perikardion "membrane around the heart" (Galen), from peri (prep.) "around, about" + kardia "heart" (see heart).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pericardium per·i·car·di·um (pěr'ĭ-kär'dē-əm)
n. pl. per·i·car·di·a (-dē-ə)
The fibroserous sac enclosing the heart and the roots of the great vessels, consisting of two layers: the visceral layer or epicardium, immediately surrounding the heart; and the outer parietal layer, which forms the sac and is lined with a serous membrane. Also called heart sac, theca cordis.

per'i·car'di·al (-dē-əl) or per'i·car'di·ac' (-dē-āk') adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
pericardium   (pěr'ĭ-kär'dē-əm)  Pronunciation Key 
Plural pericardia
The membrane sac that encloses the heart in vertebrate animals.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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