Pericardium

//ˌpɛɹɪˈkɑː(ɹ)di.əm// noun

Definitions

Noun
  1. 1
    A serous membrane that surrounds the heart allowing it to contract.

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

  2. 2
    a serous membrane with two layers that surrounds the heart wordnet

Etymology

Learned borrowing from Ancient Greek περικάρδιον (perikárdion).

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