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pericardium

(Science: anatomy) A double membranous sac which envelops and protects the heart. The layer in contact with the heart is referred to as the visceral layer, the outer layer in contact with surrounding organs is the parietal pericardium. In between the two layers is the pericardial space. A double-layered serous membrane that surrounds the heart.A [[sac like envelope of the vertebrate [[heart.