One of the mysteries of the English language finally explained.
The presence of air or gas in the pericardium. Also (more fully "artificial pneumopericardium"): the deliberate introduction of air or gas into the pericardium for therapeutic or diagnostic purposes (now rare).
Early 19th century; earliest use found in John Forbes (1787–1861), physician and medical journalist. From pneumo- + pericardium, after French pneumo-péricarde.
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