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pericardium
per·i·car·di·um [ pèrrə krdee əm ] (plural per·i·car·di·a [ pèrrə krdee ə ])


noun 
Definition:
 
sac enclosing heart: a fibrous membrane that forms a sac surrounding the heart and attached portions of the main blood vessels
[Late 16th century. Via medieval Latin< Greek perikardion< peri "around" + kardia "heart"]

per·i·car·di·ac adjective
per·i·car·di·al adjective
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