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plural pericardia or pericardiums
(anatomy, cardiology) A serous membrane that surrounds the heart allowing it to contract. quotations
The Pericardium is sometimes swelled, as overcharged with too great a quantity of Serous Liquor, making a kind of Dropsie […]
1685, Samuel Collins, “Of the Diseases of the Pericardium, and their Cures”, in The Second Volume, containing The Parts of the Middle and Highest Apartiment of Man's Body (And other Animals)