pericardium

Learned borrowing from Ancient Greek περικάρδιον (perikárdion).

• IPA^(key): /ˌpɛɹɪˈkɑː(ɹ)di.əm/

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pericardium (plural pericardia or pericardiums)

1. (anatomy, cardiology) A serous membrane that surrounds the heart allowing it to contract.
   • 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):

     The Pericardium is sometimes swelled, as overcharged with too great a quantity of Serous Liquor, making a kind of Dropsie […]

• heart sac
• theca cordis

• pericardiac
• pericardial
• pericarditis

• endocardium
• myocardium