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pericardium (n.)
early 15c., Latinized form of Greek
perikardion
"(membrane) around the heart" (Galen), from
peri
(prep.) "around, about" (see
peri-
) +
kardia
"heart," from PIE root
*kerd-
(1) "heart" (see
heart
(n.)). Related:
Pericardiac
.