A rare anatomical term referring to the region within or around the heart, or a cardiac structure or substance.
From Greek en- (in) + kardia (heart), with -ion suffix used in medical terminology. This is a very archaic or specialized medical term.
Ancient Greek doctors didn't understand the heart's electrical system, but they recognized it as the seat of emotion—the word 'cardiac' comes from the same Greek root, which is why we still say heartbreak when we're sad.
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