D defs.my
Entry 1 sense Webster, 1913

Pericardium

· Per·i·car·di·um · IPA /ˌpɛɹɪˈkɑː(ɹ)di.əm/
01 n. The double baglike fold of serous membrane which incloses the heart.
  1. 1.
    The double baglike fold of serous membrane which incloses the heart.(Anat.)